Free Printable E&M Review

1.

How do electrons differ from protons?

a)

They are the same thing

b)

Electrons hold a negative charge and protons hold a positive charge.

c)

Electrons are positively charged and protons are negatively charged.

d)

Protons are neutral

2.

Which of the following will repel one another?

a)

the North pole and South pole of a magnet

b)

a negatively-charged balloon and your positively-charged hair

c)

two positively-charged objects

d)

two objects that have the opposite charge

3.

The object pictured can be described as _______.

a)

positively charged with a net charge of +6

b)

positively charged with a net charge of +2

c)

negatively charged with a net charge of -2

d)

negatively charged with a net charged of -6

4.

As the person walks across the floor he scuffs electrons off of his shoes, he becomes ______- charged while the floor becomes _______- charged.

a)

positive, negative

b)

negative, positive

c)

negative, positive

d)

positive, negative

5.

Will the balloons ATTRACT or REPEL each other?

a)

b)

6.

The electrostatic force and the universal gravitation force are similar in that _________.

a)

both depend on fundamental quantities such as mass and charge

b)

both depend on universal constants such as G and k

c)

both depend on the inverse-square of the distance apart

d)

all of the above

7.

Recap:

Coulomb’s law states that the force between two charged objects will __________ when the magnitude of the object’s charge increases.

Coulomb’s law also states that the force between two charged objects will __________ when the distance between objects increases.

a)

increase; increase

b)

increase; decrease

c)

decrease; increase

d)

decrease; decrease

8.

A student creates identical electrical charges on identical balloons by rubbing them with a wool cloth. The balloons repel each other. According to Coulomb's Law, which should the student do to increase the electrical force of repulsion between these balloons?

a)

Increase the distance between the balloons.

b)

Increase the charge on one of the balloons.

c)

Increase the masses of the balloons.

9.

If the charge on one of the objects is doubled, what would happen to the electrical force between them?

a)

It would double. (2 times greater)

b)

It would quadruple (4 times greater)

c)

It would become ½ as much.

d)

It would become ¼ as much.

10.

If the charge on both of the objects is doubled, what would happen to the electrical force between them?

a)

It would double. (2 times greater)

b)

It would quadruple (4 times greater)

c)

It would become ½ as much. (decrease)

d)

It would become ¼ as much.(decrease)

11.

The distance between two charged objects is tripled. Which calculation shows how the electrical force between them changes?

a)

$F_{new}=\frac{1\cdot3}{1^2}=3\ \cdot F_{old}$

b)

$F_{new}=\ \frac{1}{3}=\frac{1}{3}\cdot F_{old}$

c)

$F_{new}=\frac{1}{3^2}=\frac{1}{9}=9\cdot F_{old}$

d)

$F_{new}=\frac{1}{3^2}=\frac{1}{9}\cdot F_{old}$

12.

What happens to the force between two charged objects if you double the distance between them and double the magnitude of one charge?

a)

$F_{new}=\frac{2}{2}=1\cdot F_{old}\ \left(no\ change\right)$

b)

$F_{new}\ =\ \frac{2}{2^2}=\frac{2}{4}=\frac{1}{2}\cdot F_{old}$

c)

$F_{new}=\frac{2}{2^2}=\frac{2}{4}=2\cdot F_{old}$

d)

$F_{new}=2\cdot2\ =\ 4\cdot F_{old}$

13.

What is a wire in a circuit wrapped around an iron core called?

a)

electromagnet

b)

generator

c)

electric motor

14.

What is the purpose of an iron core in an electromagnet?

a)

to hold the loops of wire in place

b)

to make the magnetic force stronger

c)

to change the direction of the electric current

d)

to change the direction of the magnetic force

15.

Which statement is TRUE about an electromagnet?

a)

It is a permanent magnet.

b)

Increasing the number of coils decreases the strength.

c)

It cannot be turned off.

d)

It is made by wrapping current-carrying wire around an iron core.

16.

Voltage can be induced in a closed loop of wire by

a)

moving the wire near a magnet.

b)

moving a magnet near the wire.

c)

both of these actions will induce a voltage.

17.

A magnet can move in a coil of wire to produce electricity. What is this device called?

a)

Electric generator

b)

Electric motor

c)

electromagnet

d)

diode

18.

Which of the following will NOT increase the amount of electricity being induced by a simple electric generator that consists of just a magnet, coil of wires, and a voltmeter to detect the amount of electricity?

a)

Increase the number of coils

b)

Use a stronger magnet.

c)

Use a stronger battery.

d)

Move the magnet faster.

19.

Which action will increase the deflection of the galvanometer pointer (electricity detector)?

a)

Use a stronger magnet.

b)

The number of turns of coils/loops is increased

c)

Move the magnet faster.

d)

All of these will increase the amount of voltage induced.

20.

A magnet is near a coil of wire that is connected to a battery. What is it?

a)

electromagnet

b)

electric motor

c)

electric generator

21.

How can an electric motor be made to spin faster?

a)

Add more loops to the coil

b)

add more batteries/increase the voltage

c)

use a stronger magnet

d)

all of these will help make a motor spin faster

22.

Looking at the magnetic field lines in this picture, these two magnets have __________ poles near each other because

a)

opposite; opposites attract

b)

like poles; like poles attract

c)

opposite poles; opposites repel

d)

like poles; like poles repel

23.

Consider the electric field lines shown in the diagram below. From the diagram, it is apparent that object A is ____ and object B is ____.

a)

+,+

b)

+,-

c)

-,+

d)

-,-

24.

Which diagram correctly shows the electric field around a negative charge?

a)

A

b)

B

c)

they are both positive

25.

Which digram shows the electric field for opposite charges

a)

b)

c)

d)

E&M Review

Total questions: 25

Worksheet time: 47mins

Similar Resources on Wayground