The coil of the ac generator rotates at a frequency of f =60.0 Hz and develops an emf of 120 V (rms). The coil has an area of A = 3.0 x 10 -3 m 2 and consists of N

5,840 results
  1. physics

    There are four coils of wire being used as electromagnets. They all have the same size and are made up of the same material but have a different number of loops. Which coil will produce a magnetic field with the maximum strength when the same amount of

  2. science

    Electromagnetic generators generate electricity. Events that occur to generate electricity are listed below. What is the correct order of events? A. The initially stationary electrons in the wire experience a force. B. The conducting coil rotates. C. The

  3. Physics

    You have a wire of length L = 2.1 m for making a square coil of a dc motor. The current in the coil is I = 1.8 A, and the magnetic field of the motor has a magnitude of B = 0.32 T. Find the maximum torque exerted on the coil when the wire is used to make

  4. Science

    Which option correctly identifies types of electromagnetic generators? (Select all that apply) transformer generator parallel generator AC generator DC generator

  5. Physics

    need help with this problem :/ A circular coil (980 turns, radius = 0.078 m) is rotating in a uniform magnetic field. At t = 0 s, the normal to the coil is perpendicular to the magnetic field. At t = 0.027 s, the normal makes an angle of 45o with the field

  6. physics problem

    Q:A 50 turns coil in a generator has an area 500cm(square)rotates in magnetic field with B=1.76 w/m(square), how fast must the coil be rotated in order to generate a maximum voltage of 220 volt? PLZ EXPLAIN WITH DATA!

  7. Physical Science

    Which of these cannot increase the strength of an electromagnet? a. making the loops smaller in the coil b. placing an iron bar in the coil c. winding more loops in the coil d. increasing the current in the coil

  8. physcial science

    A device that changes mechanical energy to electrical energy by rotating a coil of wire through a magnetic field is called a(an) A. transformer. B. generator. C. electromagnet. D. current meter.

  9. Physics

    The coil of a generator has a radius of 0.12 m. When this coil is unwound, the wire from which it is made has a length of 5.8 m. The magnetic field of the generator is 0.21 T, and the coil rotates at an angular speed of 26 rad/s. What is the peak emf of

  10. physics

    Marks: 2 The emf produced in a generator is What is the frequency of rotation of the circular coil? Choose one answer. a. 100 Hz b. 60 Hz c. 50 Hz d. 25 Hz

  11. Physics

    An electric generator contains a coil of 100 turns of wire, each turn forming a rectangular loop 50cm by 30cm. The coil is placed entirely in a uniform magnetic field with magnitude, B = 3.5T and direction initially perpendicular to the coil's plane. What

  12. Electromagnetic induction-check answers

    Please check my answers: why does an iron core increase the magnetic iduction of a coil of wire? -I am thinking it has something to do with the voltage being increased. Will a cyclist coast farther if the lamp is connected to the generator on his bicycle

  13. Physics help

    a wave with a frequency of 3.1 hz and a wavelength of 0.3 meters experiences a lengthening of wavelength to 2.6 meters what is the new frequency of this wave? a wave generator produces a wave with a frequency of 45 hz and a wavelength of 1.9 meters. If the

  14. Physics

    The generator at a power plant produces AC at 24,000 V. A transformer steps this up to 345,000 V for transmission over power lines. If there are 2,000 turns of wire in the input coil of the transformer, how many turns must there be in the output coil?

  15. Physics

    When a resistor is connected across the terminals of an ac generator (112 V) that has a fixed frequency, there is a current of 0.500 A in the resistor. When an inductor is connected across the terminals of this same generator, there is a current of 0.400 A

  16. Physics

    A square coil with 30 turns has sides that are 18 cm long. When it is placed in a 0.31-T magnetic field, a maximum torque of 0.60 N⋅m is exerted on the coil. What is the current in the coil?

  17. physics

    For a long straight wire, carrying a current of 20 A. A rectangular coil 5 x 10 cm2 is 2 cm apart. The coil carries a current of 5 A. a) determining the force acting on each segment of the rectangular coil. b) What is the net force on the coil?

  18. help!/ very puzzled

    remon rented a sprayer and a genarator. On his first job, he used each peice of equipment for 6 hours at a total cost of $90. On his second job,he used the sprayer for 4 hours and the genarator for 8 hours at the cost of $100. what was the hourly cost of

  19. Physics urgent help please

    A rectangular coil 60mm × 40mm with 25 turns is positioned with its longer sides parallel to a long straight vertical wire carrying a current of 6.8A. The coil is placed so that its long sides and the vertical wire are in the same vertical plane, with the

  20. Physics- Magnetic Field inside of coil

    Current flows through the wire coil in the direction shown by the arrows. What is the direction of the magnetic field inside the coil? (Image shows arrow pointing up into the right side of the coil and pointing down at the left side of the coil) a. upward

  21. physics

    The coil of the ac generator rotates at a frequency of f =60.0 Hz and develops an emf of 120 V (rms). The coil has an area of A = 3.0 x 10 -3 m 2 and consists of N = 500 turns. a. Find the magnitude of the magnetic field in which the coil rotates. b. If

  22. physics

    The coil of a generator has a radius of 0.12 m. When this coil is unwound, the wire from which it is made has a length of 5.5 m. The magnetic field of the generator is 0.10 T, and the coil rotates at an angular speed of 25 rad/s. What is the peak emf of

  23. Physics

    The coil of a generator has a radius of 0.12 m. When this coil is unwound, the wire from which it is made has a length of 5.8 m. The magnetic field of the generator is 0.21 T, and the coil rotates at an angular speed of 26 rad/s. What is the peak emf of

  24. Physics

    A generator has a square coil consisting of 700 turns. The coil rotates at 78 rad/s in a 0.21-T magnetic field. The peak output of the generator is 120.00 V. What is the length of one side of the coil?

  25. Physics

    A generator has a square coil consisting of 700 turns. The coil rotates at 78 rad/s in a 0.21-T magnetic field. The peak output of the generator is 120.00 V. What is the length of one side of the coil?

  26. Physics

    A generator has a square coil consisting of 700 turns. The coil rotates at 78 rad/s in a 0.21-T magnetic field. The peak output of the generator is 120.00 V. What is the length of one side of the coil?

  27. physics

    A generator uses a coil that has 280 turns and a 0.45-T magnetic field. The frequency of this generator is 60.0 Hz, and its emf has an rms value of 120 V. Assuming that each turn of the coil is a square (an approximation), determine the length of the wire

  28. physics

    The coil in a generator has 200 windings and a cross-sectional area of 0.0100 m^2. If the coil turns at a constant rotational speed and the magnetic field in the generator is that of Earth (B = 0.500 × 10^-4 T), how many 360 rotations must the coil

  29. Physics

    Hi! Need help please, thank you. Question:In a model AC generator, a 498 turn rectangular coil 14.0 cm by 21 cm rotates at 124 rev/min in a uniform magnetic field of 0.65 T. (a) What is the maximum emf induced in the coil? ___ V (b) What is the

  30. physics

    You have a coil with 20 loops inside a magnetic field generator that is temporarily generating a field that has a rate of change of -0.25. The other end of this coil is wrapped around a core with 15 turns a second coil wrapped around the same coil has to

  31. physics- magnetism

    A 0.35 m2 coil with 50 turns rotates at 5 radians per sec2 in a magnetic field of 0.6 Tesla. What is the value of the rms current in the coil if the coil has the resistance of 3.3 Ω?

  32. Physics

    A 0.35 m2 coil with 50 turns rotates at 5 radians per sec2 in a magnetic field of 0.6 Tesla. What is the value of the rms current in the coil if the coil has the resistance of 3.3 Ù? Have no idea how to do this...

  33. Physics- Circuits

    In a series RCL circuit the generator is set to a frequency that is not the resonant frequency. This nonresonant frequency is such that the ratio of the inductive reactance to the capacitive reactance of the circuit is observed to be 5.53. The resonant

  34. PHYSICS

    In a series RCL circuit the generator is set to a frequency that is not the resonant frequency. This nonresonant frequency is such that the ratio of the inductive reactance to the capacitive reactance of the circuit is observed to be 5.53. The resonant

  35. Physics

    In a series RCL circuit the generator is set to a frequency that is not the resonant frequency. This nonresonant frequency is such that the ratio of the inductive reactance to the capacitive reactance of the circuit is observed to be 4.91. The resonant

  36. Physics

    A 0.35 m2 coil with 50 turns rotates at 5 radians per sec2 in a magnetic field of 0.6 Tesla. What is the value of the rms current in the coil if the coil has the resistance of 3.3 Ù? Can you also show me how you got the answer? Thanks so much

  37. physics

    You have a coil with 20 loops inside a magnetic field generator that is temporarily generating a field that has a rate of change of -0.25. The other end of this coil is wrapped around a core with 15 turns. How many turns must a second coil wrapped around

  38. PHYSICS

    You have a coil with 20 loops inside a magnetic field generator that is temporarily generating a field that has a rate of change of -0.25. The other end of this coil is wrapped around a core with 15 turns. How many turns must a second coil wrapped around

  39. Physics

    You have a coil with 20 loops inside a magnetic field generator that is temporarily generating a field that has a rate of change of -0.25. The other end of this coil is wrapped around a core with 15 turns. How many turns must a second coil wrapped around

  40. physics

    You have a coil with 20 loops inside a magnetic field generator that is temporarily generating a field that has a rate of change of -0.25. The other end of this coil is wrapped around a core with 15 turns. How many turns must a second coil wrapped around

  41. physics

    an ac generator has 20 turns of wire of area 0.16 m2. The loop rotates in a magnetic field of 0.52 T at a frequency of 80 Hz. Find the maximum induced emf.

  42. physics

    A 35 turn coil of radius 4.9 cm rotates in a uniform magnetic field having a magnitude of 0.53 T. If the coil carries a current of 20 mA, find the magnitude of the maximum torque exerted on the coil.

  43. Science

    I need to make a generator. The really small ones that can light up a very tiny lightbulb. Basically, I need horse shoe magnets, I know that bit, bet im having trouble how to create the coil and wrap the magents, and how to build it. How do I make a coil?

  44. physics

    The rectangular coils in a 331 turn generator are 14 cm by 17 cm. What is the maximum emf produced by this generator when it rotates with an angular speed of 525 rpm in a magnetic field of 0.95 T?

  45. College Physics

    The rectangular coils in a 201-turn generator are 14 cm by 17 cm. What is the maximum emf produced by this generator when it rotates with an angular speed of 525 rpm in a magnetic field of 0.81 T? I'm not sure what equations to use.

  46. physics please help!!

    1. A 26.0-Ω resistor, a 12.0-µF capacitor, and a 17.0-mH inductor are connected in series with a 150-V generator. (a) At what frequency is the current a maximum? 2.A series circuit contains only a resistor and an inductor. The voltage V of the generator

  47. Physics

    The capacitance in a series RCL circuit is C1 = 1.2 μF, and the corresponding resonant frequency is f01 = 7.2 kHz. The generator frequency is 1.2 kHz. What is the value of the capacitance C2 that should be added to the circuit so that the circuit will

  48. Physics 212

    The armature of an ac generator has 100 turns. Each turn is a rectangular loop measuring 8.0 cm by 12 cm. The generator has a sinusoidal voltage output with an amplitude of 24 V. If the magnetic field of the generator is 250 mT, a) With what frequency does

  49. physics

    Need help on which formulas I use to solve problems? A coil of wire with 200 circular turns of radius 3.00 cm is in a uniform magnetic field along the axis of the coil. The coil has R = 40.0 ohms. At what rate, in teslas per second, must the magnetic field

  50. Physics pls help

    Consider two single turn coils labeled 1 and 2 that are positioned close to each other. The switch S has been open for a long time. If the switch is now closed and the current through coil 1 is in the direction shown and increasing, which of the following

  51. Physics Help pls

    Consider two single turn coils labeled 1 and 2 that are positioned close to each other. The switch S has been open for a long time. If the switch is now closed and the current through coil 1 is in the direction shown and increasing, which of the following

  52. PHYSICS

    Consider two single turn coils labeled 1 and 2 that are positioned close to each other. The switch S has been open for a long time. If the switch is now closed and the current through coil 1 is in the direction shown and increasing, which of the following

  53. Physics

    A rectangular coil of 70 turns, dimensions 0.100 m by 0.200 m and total resistance 10.0 ohms, rotates with angular speed 32.0 rad/s about the y axis in a region where a 1.00 T magnetic field is directed along the x axis. The rotation is initiated so that

  54. Physics

    1. What is the weight of a 24kg mass on Mars if its surface gravitaional field = 3.5N/KG? a) 235.2 N b) 84 N c) 24 kg d) 6.86 kg 2. A space shuttle is placed in a circular orbit around the Earth. It then thrusts its engine and moves to a new orbit, as

  55. Physics

    1. A rectangular coil 0.065 m by 0.080 m is positioned so that its cross-sectional area is perpendicular to the direction of a magnetic field. The coil has 66 turns and a total resistance of 7.6 Ω and the field decreases at a rate of 2.5 T/s. What is the

  56. physics

    Two parallel plate capacitors are identical, except that one of them is empty and the other contains a material with a dielectric constant of 4.2 in the space between the plates. The empty capacitor is connected between the terminals of an ac generator

  57. PHYSICS

    Two parallel plate capacitors are identical, except that one of them is empty and the other contains a material with a dielectric constant of 4.2 in the space between the plates. The empty capacitor is connected between the terminals of an ac generator

  58. Physics, science

    A sonar generator on a ship produces periodic ultrasonic waves at a frequency of 2.2 MHz. The wavelength of the waves in seawater is 5.310-4 m. When the generator is directed downward, an echo is received 15.2 s later. How deep is the ocean in m?

  59. Physics -HELP

    1. A rectangular coil 0.065 m by 0.080 m is positioned so that its cross-sectional area is perpendicular to the direction of a magnetic field. The coil has 66 turns and a total resistance of 7.6 Ω and the field decreases at a rate of 2.5 T/s. What is the

  60. Physics

    Consider a simple alternating current generator such as Hippolyte Pixii's dynamo. The current generated by such dynamo can be described as simple oscillating cosine signal. Assuming for simplicity that the max current generated each time a pole of Pixii's

  61. physics

    A series circuit contains only a resistor and an inductor. The voltage V of the generator is fixed. If R = 20 Ω and L = 2.8 mH, find the frequency at which the current is one-fifth its value at zero frequency?

  62. Physics

    A series circuit contains only a resistor and an inductor. The voltage V of the generator is fixed. If R = 15 and L = 5.6 mH, find the frequency at which the current is one-half its value at zero frequency. ?? Hz Thanks!

  63. physics

    The coil in a generator has 300 windings and a cross-sectional area of 0.0100 m2.

  64. Physics

    A series circuit contains only a resistor and an inductor. The voltage V of the generator is fixed. If R = 10 Ω and L = 4.2 mH, find the frequency at which the current is one-half its value at zero frequency? Answer in Hz

  65. hardware

    What is the maximum frequency output for a square wave from the HP 33120A Waveform Generator? I found the HP 33120A Waveform Generator on the Agilent website but I'm not sure how to figure out the problem.

  66. Physics

    The generator at a power plant produces AC at 24,000 V. A transformer steps this up to 480,000 V for transmission over power lines. If there are 2,000 turns of wire in the input coil of the transformer, how many turns must there be in the output coil?

  67. physics

    A circular coil with a radius of 25 cm has 20 turns. The coil is oriented perpendicularly to a magnetic field whose initial magnitude is 3.2 T. Suddenly, the magnetic field vanishes in 0.4 s. a. What is the initial magnetic flux in the coil? b. What is the

  68. Physics

    A sonar generator on a submarine produces periodic ultrasonic waves at a frequency of 2.60MHz . The wavelength of the waves in seawater is 5.90×10−4m . When the generator is directed downward, an echo reflected from the ocean floor is received 11.0s

  69. Physics

    Peter has a square shaped coil which include two turns of wires. One day he takes this coil to his physics lab in his school. He wants to find the voltage generated in the coil when he placed the coil inside a varying magnetic field. So he connected a

  70. physics II

    sUPPOSE YOU HAVE A square coil and a triangular coil each have sides of length L. The triangular coil has twice as many turns as the square coil. If a the same current is sent through each coil, when the coils are placed in the same uniform magnetic field

  71. physics

    A single circular loop of wire of radius r = 2.5cm rotates at a frequency of 60 Hz in a constant magnetic field of magnitude B = 1.8 T. Use this to design a generator that produces an induced emf of 430 V. Hint: You must choose values for the number of

  72. Accounting 2

    At the beginning of the year, we purchased a generator for $ 56,000. We expect then generator to have a useful life of 12 years, or 60,000 hours. The residual value of the generator at the end of its life is expected to be $ 5,600. We actually used the

  73. Physics

    A circular conducting coil with radius 3.40 cm is placed in a uniform magnetic field of 1.090 T with the plane of the coil perpendicular to the magnetic field. The coil is rotated 180° about the axis in 0.222 s. (a) What is the average induced emf in the

  74. Physics

    When a resistor is connected across the terminals of an ac generator (112 V) that has a fixed frequency, there is a current of 0.500 A in the resistor. When an inductor is connected across the terminals of this same generator, there is a current of 0.400 A

  75. physics - magnetism

    A simple generator has a 780-loop square coil 21.0 cm on a side. How fast must it turn in a 0.650 T field to produce a 150 V peak output? I got 6.71 rev/s but that is wrong

  76. Industrial electronics

    A voltage at a frequency of 500KHz is maintained across a coil with a variable capacitor .when the capacitor is set to 455pF, the current has its maximum value, but when the capacitance is reduced to 424pF , the current is 0,707 of its maximum value.

  77. Physics

    a uniform magnetic field of strength 0.5T is directed at an angle of 30degree to the plane of 100turns regular copper coil of lenght 0.04m and width 0.05mm. the diameter of the copper wire which makes up a coil is 1mm and the resistivity of copper is

  78. Physics

    A coil of wire with 200 circular turns of radius of 3 cm is in a uniform magnetic field along the axis of the coil. the coil has R=40 ohms. At what rate, in Teslas per second, must the magnetic field be changing to induce a current of .150 A in the coil? I

  79. Science

    A coil of inductance 0.04henry and negligible resistance is connected in parallel with a 10ohms resistor, across a 240volts supply of frequency 50hz. Calculate:1) the current through the resistance, 2) the current through the coil, 3)the supply current,

  80. Physics

    A transformer has 120 V across the 100-turn primary coil and has 5 turns in the secondary coil. If the current in the primary coil is 0.1 A, how much power is dissipated in the secondary coil?

  81. Physics

    A coil is made up of 19 square loops with the sides equal to 5.3 cm. The coil is placed in a uniform 350 mT magnetic field with the axis of the coil parallel to the magnetic field. If the field reverses direction in 0.17 seconds, what is in volts, the

  82. Physics

    A circular coil (660 turns, radius = 0.037 m) is rotating in a uniform magnetic field. At t = 0 s, the normal to the coil is perpendicular to the magnetic field. At t = 0.024 s, the normal makes an angle of 45o with the field because the coil has made

  83. physics

    can anyone please help me on this one? A circular coil (980 turns, radius = 0.078 m) is rotating in a uniform magnetic field. At t = 0 s, the normal to the coil is perpendicular to the magnetic field. At t = 0.027 s, the normal makes an angle of 45 degrees

  84. physics

    A circular coil (980 turns, radius = 0.078 m) is rotating in a uniform magnetic field. At t = 0 s, the normal to the coil is perpendicular to the magnetic field. At t = 0.027 s, the normal makes an angle of 45o with the field because the coil has made

  85. statistics

    the probability that a key component of a stand -by generator will fail during a power outage is q. A generator works if at least half of its key component work.Assuming that the the generator has four key components. find the probability that the

  86. Physics - Flux

    The coil has a radius of 8 cm and 110 turns. While moving the magnet farther away from the coil, at a certain point in time, the voltage meter shows -390 mV. What is the magnitude of the rate of change of the flux through the coil?

  87. Physics

    A current I=2 Amperes flows in a circular single loop coil of radius R=10 cm. (a) Evaluate the magnitude of the magnetic field (in Tesla) at a point P on the axis of the coil, and a distance z=5 cm away from the plane of the coil itself

  88. Physics

    The primary coil of a transformer has 739 loops. The secondary coil has 953,677 loops. The primary coil has a 76 A current and 58 V. b.) Determine the power of the primary coil. W c.) Assuming no losses, determine the power of the secondary coil. W d.)

  89. Physics

    I have a 250- turn circular coil of wire, 0.10 m in diameter, perpendicular to a 0.050 T magnetic field as shown below. I flip the coil 180 degrees in 1/30 of a second. What is the average voltage created across the ends of the coil? A. -6.0 V B. -12 V C

  90. electromagnetism

    #6 (6 points possible) The demonstration in LS6.U5 uses a Helmholtz coil, which is a pair of wire coils along a common axis that creates a somewhat uniform magnetic field at the center. To achieve a uniform field, the coil separation is equal to the coil

  91. Physics

    1)An increase in the velocity of wire moving perpendicular through a magnetic field increases the induced EMF. true. confused me 2)There are four coils of wire being used as electromagnets. They all have the same size and are made up of the same material

  92. Physics

    There are two tubes that are identical except for their slightly different lengths. Both tubes have one open end and one closed end. A speaker connected to a variable frequency generator is placed in front of the tubes. The speaker is set to produce a note

  93. Electrical Engineering

    Winter is coming, so I want to make a 1500 W heating coil which will plug into a 120 V wall outlet. The coil will have a cross sectional area of 0.01 cm2 and a length (when fully unwound) of 5 m. Determine the resistivity of the coil required, in Ωcm:

  94. algebra

    the length of a coil l (in centimeters) is a function of the weight w (in kilograms) applied to the coil. For a particular coil, the function is represented by the equation l=54-3w. Explain the meaning of the numbers 54 and -3 within the context of this

  95. science

    if a magnet is moved in and out of a coil of a copper wire, electrcity begins to flow through the coil. True or False If the coil is in a closed circuit then electricity will flow, if not there will be only an induced emf.

  96. physics so confused

    1. A 26.0-Ω resistor, a 12.0-µF capacitor, and a 17.0-mH inductor are connected in series with a 150-V generator. (a) At what frequency is the current a maximum?

  97. Physics

    The maximum torque experienced by a coil in a 0.90 T magnetic field is 8.4 10-4 N·m. The coil is circular and consists of only one turn. The current in the coil is 3.9 A. What is the length of the wire from which the coil is made? Please tell me if I am

  98. math

    The voltage (in volts) induced in a coil of wire is v = (2t + 1)0.5. The current in the coil is initially 0.3 amps, and the inductance is 5H. What is the equation for the current in the coil?

  99. math

    The voltage (in volts) induced in a coil of wire is v = (2t + 1)^0.5. The current in the coil is initially 0.3 amps, and the inductance is 5H. What is the equation for the current in the coil?

  100. Math

    The voltage (in volts) induced in a coil of wire is v = (2t + 1)^0.5. The current in the coil is initially 0.3 amps, and the inductance is 5H. What is the equation for the current in the coil?

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