Electrostatics & Magnetism ReviewPhysics I

Electric Field lines exit __ charges and enter ___ charges.

1. Neutral , negative2. Negative, Positive3. Positive, Negative4. Positive , Neutral

What causes an object to become electrically charged?

1. Gain or Loss of protons

2. Gain or Loss of electrons

3. Gain or loss of neutrons

One of these isolated charged spheres is copper and the other is rubber. The diagram below depicts the distribution of excess negative charge over the surface of two spheres.

Which material is copper?

1. A2. B3. Neither

If the distance between two charges is doubled, then the force of attraction or repulsion would

1. Double.2. Quadruple3. Reduce to half.4. Reduce to ¼.

As shown in the diagram below, a charged rod is held near, but does not touch a neutral electroscope. The

charge on the knob becomes

If your comb becomes negatively charged when combing your hair

then which of the following occurred?

1. Hair lost electrons2. Hair gained

electrons3. Hair lost protons4. Hair gained protons

One object has a charge of +3 C and the other is -7 C. What is the final charge on the objects after they

touch?

1. -42. +43. +24. -25. -106. +10

The diagram below illustrates

1. Charging by friction2. Charging by induction3. Charging by conduction

Where is the electric forcestrongest on the test charge?

++

++

+

+++

Q

A

B

C

1. A2. B3. C

What is the resulting direction at point J of the electric fields created by both charges?

A. RightB. LeftC. ZeroD. Cannot be determined.

2. If you put a small compass in a magnetic field, the compass will

a. line up in a direction parallel to the magnetic field lines.

b. swing randomly.c. line up in a direction

perpendicular to the magnetic field lines.

d. seek electrical charge concentrations.

What is the direction of the force on the negative charge in the figure?

1. Up 2. Down3. Left4. Right5. Into Page6. Out of page

__

What is the direction of the force on the positive charge?

A. UpB. DownC. LeftD. RightE. Into PageF. Out of page

Two identical charges of +3µC are 2 m apart. What force do they exert on one another?

0.02 N

A charge of -5x10-5 C is 50 cm from a 3x10-5 C charge. What magnitude of force do they exert

on one another?

54 N

Moving electric charges are surrounded by

a. only electric fields.b. only magnetic fields.c. both magnetic and

electric fields.d. nothing.

The magnetic field lines about a current-carrying wire form

a. circles.b. radial lines.c. eddy currents.d. spirals.

Which charge has the greatest field strength?

A. GB. HC. ID. All are equal

A positive charge enters the magnetic field below. The force on the charge is down.

What is the direction of the velocity?

1. Up2. Left3. Right4. Out of page5. Into Page

Force

A current carrying wire is placed in the magnetic field below. What is the direction of

the force on the wire?

N S N S

1. Up 2. Down3. Left4. Right5. Into page6. Out of page

I

The Earth’s Magnetic North is located at

a. The South geographic poleb. The North Geographic pole.c. The equator.

Which diagram best illustrates the electric field around two unlike charges?