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Electricity and Magnetism
Page 5
Questions (3,267)
Electric charge is distributed over the disk
x^2+y^2≤5 so that the charge density at (x,y) is σ(x,y)=16+x^2+y^2 coulombs per
2 answers
asked by
val
58 views
A rectangular coil 30cm long and 20cm wide has 250 turns. It rotates at the uniform rate of 3000 rev/minute about an axis
2 answers
asked anonymously
130 views
Your class is designing electromagnets. Available materials include: various batteries, different sizes of iron nails, and a
3 answers
asked by
Help The ELA Kid📃✏️😔
119 views
The students in Mr. Jones' class designed their own electromagnetic with a copper wire, a D battery, and a large iron nail. All
2 answers
asked by
Help The ELA Kid📃✏️😔
128 views
When an electric current is flowing through a wire, the force deflecting the charged particles is greatest when the wire is
3 answers
asked by
cal
105 views
The power substation pictured uses transformers to step down the voltage in order to make it ready to travel over the
3 answers
asked by
cal
116 views
In which kind of material is charge most easily transferred?
a nonconductors b semiconductors c conductors d insulators e train
1 answer
asked by
A
73 views
A transformer is used to step up or down the voltage in power lines. It uses two coils that are near but not connect to each
1 answer
asked by
physics
82 views
Braddy connected the loose wire to the battery and created an electromagnet. He picked up 45 thumb tacks with his electromagnet,
1 answer
asked by
physics
80 views
What generates the magnetic field that surrounds a wire carrying an electric current?
A: motion of electrons in the wire B:
1 answer
asked by
physics
70 views
Which of these would be LEAST useful if one is attempting to create a electromagnet?
A: distilled water B: battery C: coil of
1 answer
asked by
physics
47 views
Which statement describes a difference between insulators and conductors?
* 1 point Insulators have high resistance, while
1 answer
asked by
MrTang
198 views
A student observed interactions between two sets of electrical charged objects in each set. The object carried either a charge
1 answer
asked by
Jo
104 views
Examine the charge distribution shown. Sphere 1 has a charge of +3.0 × 10-4
C; sphere 2 has a charge of –3.0 × 10-4 C;
4 answers
asked anonymously
72 views
For components in parallel the potential difference
1 answer
asked by
asjdhwuei
71 views
Hal makes an electromagnet with a 9-volt battery, wire, and a steel rod. What is the function of electric current in his
4 answers
asked by
Hlo
294 views
The resistance in a circuit is halved. What happens to the voltage?
V = IR (1 point) O The voltage is doubled. The voltage is
3 answers
asked by
Hlo
311 views
Sally puts on wool socks and rubs her feet on a nylon carpet. How does static electricity build up in Sally? (1 point)
When
4 answers
asked by
Hlo
468 views
A student observes interactions between two sets of electrically charged objects. In each set, the objects carry either a charge
1 answer
asked by
brielle
249 views
How does the magnitude of the electrical charge on objects affect the electric force between them
1 answer
asked anonymously
137 views
Using Coulomb's Law, if the size of one of the charges increases (and the distance remains the same), what happens to the
1 answer
asked by
6
182 views
Sam, an electrician, wraps a copper wire with a thick plastic coating. What is he most likely trying to do?
a keep a current from
3 answers
asked by
shoto
211 views
How does increasing the distance between charged objects affect the electric force between them?
a The electric force increases
1 answer
asked by
shoto
119 views
A 12-V battery is connected to a light bulb with a resistance of 2Ω. What is the current in the circuit? **You must show all
1 answer
asked by
shoto
112 views
Choose the small iron rod, 3 coils and 3 batteries. How many paperclips can be lifted?
1 answer
asked by
ok
73 views
Use Ohms law to solve the problem: What is the resistance of a light if the voltage is 12.0 V and the current is 0.30 A?
1 answer
asked by
ok
67 views
State Kirchoff's law and derive the expression for the law. Also explain what is a gray surface?
1 answer
asked by
Ruhi
126 views
which is the best description of how to build an electromagnet
attach one end of a wire to a Battery and attach the other end of
1 answer
asked by
shoto
125 views
A student rubs a rubber rod with fur, producing a negative charge on the rod. The student then touches the rod to a hollow,
6 answers
asked by
Ken
95 views
Robin has an iron rod around which she wraps copper wire. She places the device on a table near a compass. What will happen to
1 answer
asked by
Ken
99 views
Which is the best description of how to build an electromagnet?(1 point)
Responses Connect one end of a battery to an iron or
3 answers
asked by
456789
112 views
Use the sliding scale on the battery to change the voltage.
How does changing the voltage influence the magnetic field? a
1 answer
asked by
A
133 views
For the magnetic field created around a current carrying wire in an electromagnet, the ___________ the current, the ________ the
1 answer
asked by
Science
55 views
What is produced by the movement of electrons within a material?(1 point)
Responses ionic reactions ionic reactions chemical
2 answers
asked by
Randy Waldroupe
94 views
Attach a wire to one end of a battery, wrap the wire around an iron or steel core, and attach the other end of the wire to the
1 answer
asked by
Hlo
71 views
What is electromagnetism?
the combination of batteries with magnets the relationship between electricity and magnetism a type of
1 answer
asked by
mir
77 views
What is one difference between a galvanometer and an electric motor?
An electric motor uses electrical energy to spin. A
1 answer
asked by
mir
135 views
An electromagnet is a coil of wire with a current running through it. This creates an electromagnetic field. An additional
1 answer
asked by
j
160 views
Which analogy best describes voltage?(1 point)
Responses diameter of a pipe through which water move diameter of a pipe through
3 answers
asked by
A
148 views
Three cells each of e.m.f2v and negligible internal resistance 2ohmsand 6ohms and a key.Draw a circuit diagram for the above
3 answers
asked by
Mildred
108 views
Conductors and Insulators Quick Check
2 of 52 of 5 Items Question Which of the following best describes a direct current?(1
3 answers
asked by
social studies
200 views
How does changing the number of loops affect the magnetic field?
a Increasing the number of loops, does not change the magnetic
1 answer
asked by
social studies
94 views
Like charges attract, and opposite charges repel.
True False
1 answer
asked by
social studies
51 views
Strength of Electrical Forces Quick Check
4 of 54 of 5 Items Question In which of the following interactions will the amount of
4 answers
asked by
social studies
316 views
Robin has an iron rod around which she wraps copper wire. She places the device on a table near a compass. What will happen to
3 answers
asked by
Anonymous ;)
338 views
Which of the following statements accurately reflects the relationship between force and distance in Coulomb’s Law?(1 point)
Re
2 answers
asked by
A
181 views
charge?(1 point)
Responses The lesser the distance between the pith balls, the greater the amount of electric charge that exists
1 answer
asked by
A
54 views
When a plastic rod is rubbed with a wool cloth, the wool acquires a positive charge. What is the best explanation for this
1 answer
asked by
Anonymous ;)
248 views
A mechanic dropped a bolt he needed to repair a car motor. He decided to make a simple electromagnet to try to attract the metal
1 answer
asked by
Anonymous ;)
303 views
A student built a simple electromagnet with copper wire, an iron bolt, and a 1.5-volt battery. The electromagnet was able to
15 answers
asked by
Anonymous ;)
666 views
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