A flywheel has a small magnet mounted on it. EAch time the magnet passes the coil, a voltage pulse is generated, which is passed to the c.r.o. The display of the c.r.o. is 10cm wide. The flywheel is rotating at

46,804 results
  1. Science

    An electromagnet is the most powerful type of magnet there is . It is a magnet with a current running through it that can be turned on and off , Why might it be useful to be able to turn the electromagnet on and off ? To control the strength of the magnet

  2. physics

    Moving a magnet inside a coil of wire will induce a voltage in the coil. How is the voltage in the coil increased? by moving the magnet inside the coil of wire more slowly by moving the magnet inside the coil of wire more rapidly by holding the magnet

  3. magnetism

    Moving a magnet inside a coil of wire will induce a voltage in the coil. How can the voltage in coil be increased? move the magnet inside the coil of wire more slowly hold the magnet stationary move the coil of wire slowly and keep the magnet stationary

  4. Physics

    Two strong magnets on opposite sides of a small table are shown. The long-range attractive force between the magnets keeps the lower magnet in place. Suppose the weight of the table is 26.1 N, the weight of each magnet is 8.99 N, and the magnetic force on

  5. physics

    Two strong magnets on opposite sides of a small table are shown. The long-range attractive force between the magnets keeps the lower magnet in place. Suppose the weight of the table is 26.7 N, the weight of each magnet is 6.55 N, and the magnetic force on

  6. physics

    Magnet A has twice the magnetic field strength of magnet B and at a certain distance pulls on magnet B with a force of 75 N. With how much force, then, does magnet B pull on magnet A?

  7. physics

    a strong magnet attracts a paper clip to itself with a certain force. Does the paper clip exert a force on the strong magnet? If so, why not? If so, does it exert as much force on the magnet as the magnet exerts on it? Newtons Third Law: Forces are always

  8. Science

    1.Electric charges that are different (1 point) attract each other. repel each other. exist in pairs. do not interact. 2. Magnetic field lines around a bar magnet (1 point) are only perpendicular to the magnet. spread out from one pole and curve around to

  9. physics- answers check

    1. For a bar magnet, the magnetic field lines point a. towards the South pole. b. towards the North pole. c. always towards the magnet. d. always away from the magnet. my answer: a 2. Magnetic field lines a. are straight lines. b. are always circles. c.

  10. College physics

    According to Newton's Third Law, for every action there is an equal an opposite reaction. If the current on the wire is such so that the magnetic force on the wire points upward, what must be true? 1. There is no force on the magnet. All forces act on the

  11. Science

    The magnet is moved in and out of the coil of wise .What happens to the galvanometer needle ?

  12. Physics

    You stick a paper onto a fridge with a magnet. There are two free body diagrams, one for the paper and one for the magnet. What are the forces acting on each object, which way do they point?

  13. Science 7B

    An electromagnet is the most powerful type of magnet there is. It is a magnet with a current running through it that can be turned on and off. Why might it be useful to be able to turn the electromagnet on and off?(1 point) to latch onto and let go of

  14. Physical Science

    The Magnetic field lines of a bar magnet begin near the magnet's _____________. I believe this question is asking where the lines begin (ie leave) the bar magnet...which would be the north pole.

  15. physics

    A flywheel has a small magnet mounted on it. EAch time the magnet passes the coil, a voltage pulse is generated, which is passed to the c.r.o. The display of the c.r.o. is 10cm wide. The flywheel is rotating at a rate of about 3000 revolutions per

  16. Physics

    Faraday's law: If the number of loops in a coil around a moving magnet doubles what happens to the brightness of the bulb if the speed of the magnet remains the same?

  17. physics

    manet A has twice the magnetic field strength of magnet B (at equal distance ) and , at a certain distance,it pulls on magnet B with force of 50n. with how much force, then dose magnet B PULL ON MAGNET a?

  18. physics question

    I have a question about a problem regarding Newton's third law. a. An iron rod is held up by a magnet. The magnet is held up by a string (from a ceiling, let's say). Draw a free-body diagram for the magnet and a separate free-body diagram for the iron rod.

  19. electricity

    if a bar of copper is brought near a magnet, the copper bar will be? A)attracted by the magnet. B)unaffected by the magnet. C)repelled by the magnet. D)made into an induced magnet. B)unaffected by the magnet. Actually there is a very slight repulsn due to

  20. physics

    A 20 g fridge magnet is being held onto the fridge by a 0.9 N force. coefficient of kinetic friction is 0.3 . a. calculate the friction acting on the magnet. b. calculate the weight of the magnet c.the acceleration of the magnet. also, explain the

  21. Physics

    Moving a magnet back and forth inside a coil of wire induces a current. How does the speed of the motion affect the magnitude of the current? Can someone please help me with this?? It would be much appreciate!! (=

  22. Physics

    13. George has a bar magnet and a coil connected to a battery. To perform an experiment, he needs to use different values of current through the wire. How can he generate different values of electric current through the wire without connecting any other

  23. Science

    A ferromagnetic material is A) always a magnet B) a magnet if it's domains are aligned C) a magnet if it's domains are not aligned D) never a magnet I'm pretty sure it's A....

  24. Physics

    A rectangular coil of wire has a dimensions of 4.9 cm by 9.7 cm and is wound with 84 turns of wire. It is turned between the pole faces of a horseshoe magnet that produces an approximately uniform field of 0.54T, so that sometimes the plane of the coil is

  25. Science

    A magnet was placed near a pile that contained both iron and sulfur. The magnet was moved gradually closer to the pile. As it neared the pile, the magnet started attracting small pieces of iron from the pile. What best describes? A. Solution or iron and

  26. Physics

    You stick a paper onto a fridge with a magnet. There are two free body diagrams, one for the paper and one for the magnet. What are the forces acting on each object, which way do they point?

  27. Physics Help!

    The Fly wheel has a small magnet of mass M mounted on it. Each time the magnet passes the coil, a voltage pulse is generated , which is passes to the c.r.o the display of the c.r.o is 10 cm wide . The flywheel is rotating at a rate of about 3000

  28. college physics

    small one-cylinder gasoline engines sometimes use a device called a magneto to supply current to the spark plug. A permanent magnet is attached to the flywheel, and a stationary coil is mounted adjacent to it. Explain how this device is able to generate

  29. Physical Science Question 4

    How can a permanent magnet be demagnetized? A.Cut the magnet in half. B.Heat the magnet up C.Strike the magnet with a heavy blow D.both b and c You will find the answer if you read this: http://my.execpc.com/~rhoadley/magcare.htm

  30. physics

    Two strong magnets on opposite sides of a small table are shown. The long-range attractive force between the magnets keeps the lower magnet in place. Suppose the weight of the table is 19.7 N, the weight of each magnet is 4.17 N, and the magnetic force on

  31. physics

    A 20 g fridge magnet is being held onto the fridge by a 0.9 N force. coefficient of kinetic friction is 0.3 . (please include an FBD when giving the solutions) a. calculate the friction acting on the magnet. b. calculate the weight of the magnet c.the

  32. Physics

    An electromagnet has a steel core (κM≈ 2500) with an approximately circular cross sectional area of 7.0 cm2. The radius of the magnet is 12.0 cm; there is a small air gap of only 2.2 mm (see sketch). The current through the magnet's N= 120-turn coil is

  33. 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

  34. 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

  35. Physics

    A common pickup for an electric guitar consists of a coil of wire around a small permanent magnet, as described in Figure 25.5. Why will this type of pickup fail with nylon strings?

  36. physics

    A typical magnitude of the external magnetic field in a cardiac catheter ablation procedure using remote magnetic navigation is B = 0.080 T. Suppose that the permanent magnet in the catheter used in the procedure is inside the left atrium of the heart and

  37. physics

    A magnet is plunged into and out of a coil of wire 2 times per second. This induces 5 volts. a- If the rate of motion changes so that the magnet is plunged in and out 6 times per second, what will be the new induced voltage? b- if the number of coils in

  38. science

    when current flows through a wrapped in coils around a bar magnet, a temporary magnet known as a _________________ is created. Did you omit a word? perpahs metal. For the blank, are you thinking of electromagnet?

  39. Physics

    If you cut a magnet in half does each half become a magnet. Give a clear explanation to your answer.

  40. PHYSICS

    A 0.75 Tesla bar magnet is placed inside of a coil made up of 350 turns of wire, each loop having an area of 0.002 m^2. How much electromagnetic flux is created when the magnet is quickly pulled out of the coil? How much voltage is induced in the coil if

  41. electromagnetism

    Two identical bar magnets A and B are held at rest as shown and released to fall simultaneously. Magnet A as it falls passes through the center of a copper ring, magnet B does not. #9 (4 points possible) Which of the following statements is true? -

  42. magnetism

    How can a permanent magnet be demagnetized? cut the magnet in half heat the magnet up (my choice) strike the magnet with a heavy blow both the second and third choices above

  43. physics opinion

    A common pickup for an electric guitar consists of a coil of wire around a permanent magnet. The permanent magnet induces magnetism in the nearby guitar string. When the string is plucked, it oscillates above the coil, thereby changing the magnetic field

  44. Fourth grade science

    Students are conducting an investigation that tests the force of a magnet by using one magnet to repel a second magnet. Which tool would be needed to measure the distance the second magnet moves? A thermometer,A spring scale, A ruler, or A compass

  45. 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

  46. Physics PLEASE HELP

    Two strong magnets on opposite sides of a small table are shown. The long-range attractive force between the magnets keeps the lower magnet in place. Suppose the weight of the table is 19.7 N, the weight of each magnet is 4.17 N, and the magnetic force on

  47. Physics

    Two strong magnets on opposite sides of a small table are shown. The long-range attractive force between the magnets keeps the lower magnet in place. Suppose the weight of the table is 23.4 N, the weight of each magnet is 2.67 N, and the magnetic force on

  48. Physics

    Two strong magnets on opposite sides of a small table are shown. The long-range attractive force between the magnets keeps the lower magnet in place. Suppose the weight of the table is 23.4 N, the weight of each magnet is 2.67 N, and the magnetic force on

  49. physics PLEASE HELP

    Two strong magnets on opposite sides of a small table are shown. The long-range attractive force between the magnets keeps the lower magnet in place. Suppose the weight of the table is 19.7 N, the weight of each magnet is 4.17 N, and the magnetic force on

  50. Physics

    Two strong magnets on opposite sides of a small table are shown. The long-range attractive force between the magnets keeps the lower magnet in place. Suppose the weight of the table is 23.4 N, the weight of each magnet is 2.67 N, and the magnetic force on

  51. Physics

    Two strong magnets on opposite sides of a small table are shown. The long-range attractive force between the magnets keeps the lower magnet in place. Suppose the weight of the table is 19.7 N, the weight of each magnet is 4.17 N, and the magnetic force on

  52. 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?

  53. Physics

    A 5 kg magnet exerts a constant force of 3 N on a 0.25 kg magnet. 1) What force will the smaller magnet exert on the larger magnet? Please show step by step including the right equations for this problem

  54. physics

    A 5 kg magnet exerts a constant force of 3 N on a 0.25 kg magnet. What force will the smaller magnet exert on the larger magnet?

  55. physics

    A 5 kg magnet exerts a constant force of 3 N on a 0.25 kg magnet. What force will the smaller magnet exert on the larger magnet?

  56. physics

    A 5 kg magnet exerts a constant force of 3 N on a 0.25 kg magnet. What force will the smaller magnet exert on the larger magnet?

  57. physics

    A 5 kg magnet exerts a constant force of 3 N on a 0.25 kg magnet. What force will the smaller magnet exert on the larger magnet?

  58. mechanics

    Dylan hangs a calendar on a refrigerator with a magnetic hook. Unfortunately, the magnet is too weak, so the magnet and calendar slide down the side of the refrigerator to the floor with an acceleration of magnitude 3ms2. If the coefficient of sliding

  59. Physics

    a 1.2 kg magnet is capable of holding up a 0.5 kg mass. the magnet is placed on a vertical refrigerator door and given an initial push so that it slides up the door with an initial velocity of 0.11 m/s. if the coefficient of kinetic friction between the

  60. mechanics

    Dylan hangs a calendar on a refrigerator with a magnetic hook. Unfortunately, the magnet is too weak, so the magnet and calendar slide down the side of the refrigerator to the floor with an acceleration of magnitude 3ms2. If the coefficient of sliding

  61. science

    A magnet is plunged into and out of a coil of wire 2 times per second. This induces 5 volts. a- If the rate of motion changes so that the magnet is plunged in and out 6 times per second, what will be the new induced voltage?

  62. Physics. Help please

    A small permanent magnet is located on the x-axis with the center at cm. The magnet’s North pole is at location cm and the South pole is at location cm. A current loop is placed in the y-z plane, such that its center is at the origin. It has a radius

  63. Physics

    A dip needle is a small magnet mounted on a horizontal axis sot that it can swivel up or down. Where on eath will it point most nearly vertically and most nearly horizontally?

  64. physics

    A large bar magnet (mass of 0.4 kg) exerts a 5 N force on a small bar magnet (mass of 0.1 kg) located 20 cm away. Calculate the force exerted by the small bar magnet on the large one.

  65. Physics

    An electromagnet has a steel core (κM≈ 2500) with an approximately circular cross sectional area of 8.0 cm2. The radius of the magnet is 7.0 cm; there is a small air gap of only 3.2 mm (see sketch). The current through the magnet's N= 100-turn coil is

  66. physics

    The drawing shows a steel ball rolling along a flat surface at constant velocity from point A to point B. A magnet exerts an attractive force on the ball only for the short time that passes as the ball rolls past point B. Which one of the following

  67. physics

    he drawing shows a steel ball rolling along a flat surface at constant velocity from point A to point B. A magnet exerts an attractive force on the ball only for the short time that passes as the ball rolls past point B. Which one of the following

  68. 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.

  69. SCIENCE GRADE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    If you had a piece of magnet and you stuck it to an iron nail, and you stuck it to a small washer. How would the washer stick to the iron nail.Please check to see if I'm write! The piece of magnet gets attracted to iron objects the iron nail.the iron nail

  70. Physics

    A permanent magnet creates a homogenous magnetic field B~ inside a rectangular region. The magnet is moving with a velocity ~v ⊥ B~ . A particle at rest with mass m and charge Q is on the path of the magnet. Assume that the magnet has a mass much larger

  71. science

    Miguel held a magnet 2cm above some steel safety pins.his magnet picked up eight pins. what will happen if Miguel holds magnet 4cm above the pins?why?

  72. physics

    A student thrusts a 0,20T magnet with a cross sectional area of 2.0 cm^2 into a coil of 400 turns in 0,50s. The coil has a resistance of 30 ohms and it is connected in series with a moving coil meter having a resistantace of 170 ohms. What is the average

  73. physics

    A student thrusts a 0,20T magnet with a cross sectional area of 2.0 cm^2 into a coil of 400 turns in 0,50s. The coil has a resistance of 30 ohms and it is connected in series with a moving coil meter having a resistantace of 170 ohms. What is the average

  74. physics

    how much output I can get if a coil having 100000 turns moves pass a strong 3000 gauss neodymium magnet only once a time?

  75. Physical Science

    A ferromagnetic material is A) always a magnet B) a magnet if it's domains are aligned C) a magnet if it's domains are not aligned D) never a magnet I think it is A....

  76. Physics

    A common pickup for an electric guitar consists of a coil of wire around a small permanent magnet. Why will this type of pickup fail with nylon strings?

  77. physics

    how much output I can get if a coil having 100000 turns moves pass a strong 3000 gauss neodymium magnet with 10 m/s velocity only once a time?

  78. physics

    If I bring a 500 gauss magnet near to a 50 gauss magnet to repel them each other.will then both magnets repel each other with equal force or the 500 gauss magnet will repel 50 gauss magnet to more distance?

  79. Science

    When a bar magnet is cut into 2, the two halves repel each other. Why? What becomes the original north and south poles of that magnet?

  80. Science

    When a bar magnet is cut into two halves repel each other. Why? What becomes of the original north and south poles of that magnet??

  81. Science

    When a bar magnet is cut into two halves repel each other. Why? What becomes of the original north and south poles of that magnet?

  82. Phys..magnets

    can someone please explain this aim: To investigate how the force acting on a bar magnet placed in a current carrying coil is related to the coil??? what is the force called?

  83. science 10

    is it possilbe to make a magnet with one pole (monopole magnet) explain

  84. Magnets-Physics

    I have a few questions that I am not too sure of. why is it inadvisable to make a horseshoe magnet from a flexible material? -is it because it would have enough magnetism Do the poles of a horseshoe magnet attact each other? If you bend the magnet so that

  85. phys

    or..can someone tell me what will happen when a bar magnet is placed in a current carrying coil?

  86. physics

    A dip needle is a small magnet mounted on ahorizontal axis so that it can swivel up or down like a compass turned on it's side) where on earth will a dip needle point most nearly vertically? where will it point most nearly horizontally?

  87. Physics

    A "dip needle" is a small magnet mounted on a horizontal axis so that it can swivel up or down. Where on Earth will a dip needle point most nearly verically? Where will it point most nearly horizontally?

  88. Physics

    You stick a paper onto a fridge with a magnet. There are two free body diagrams, one for the paper and one for the magnet. What are the forces acting on each object, which way do they point?

  89. 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?

  90. Physics

    Why does a piece of iron behave like a temporary magnet when placed in a magnetic field? SOLUTION: Iron consists of many small magnetic domains which all line up and temporarily behave like an ordinary magnet when iron is placed in an external magnetic

  91. physics

    A strong electromagnet produces a uniform field of 1.31 T over a cross-sectional area of 0.195 m2. A coil having 245 turns with a total resistance of 16 is placed around the electro- magnet, and the current in the electromagnet is turned off, reaching zero

  92. Science

    Place the North Pole of a bar magnet to the North Pole of another bar magnet. Note the distance at which they repel each other. Then place the North Pole of a bar magnet to the South Pole of another bar magnet and take note of the distance at which they

  93. Science

    How can a piece of wire be turned into a magnet? A. Rubbing it up against rubber B. Running electricity through it

  94. physics

    Survival flashlights have a hand crank, that when turned, spins a magnet inside a coil of wire. Why does this make the flashlight work?

  95. physcial science

    Why is a nail attracted to either pole of a magnet, but another magnet is attracted to only one of the poles?

  96. Physics

    A coil of 50turns is pulled in 0.02secs from between the poles of a magnet where it's area includes 31× 10^-5 Weber to a place where it's area includes 1 x 10^-5 Weber.Determine the average emf induced in the coil A.0.75V B.0.075 C.75V D.7.5V?

  97. SCIENCE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    when you are using a magnet and a paper clip to detect a magnet from inside the box. WHY is the magnet better than the paper clip to detect another magnet from inside a box?

  98. science

    if a bar of copper is brought near a magnet, the copper bar will be not magnetic, nonferrous, not attracted to the magnet, etc

  99. Physics

    Newton showed that the motion of comets is controlled by gravitational attraction of gravity. Many comets move in elliptical orbit but if they are moving very fast they will perform a hyperbolic orbit. A student attempts to model the hyperbolic trajectory

  100. College physics

    In the image below, you will see a current balance setup where the current I is coming out of the page in between the two poles of the magnet N and S. What is the direction of the magnetic field B in the region where current I is? The Image shows the north

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