1. Electrostatics & Magnetism Review Physics I

2. Electric Field lines exit __ charges and enter ___ charges.
Neutral , negative
Negative, Positive
Positive, Negative
Positive , Neutral

3. What causes an object to become electrically charged?
Gain or Loss of protons
Gain or Loss of electrons
Gain or loss of neutrons

4. 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? A B
Neither

5. Double. Quadruple Reduce to half. Reduce to ¼.
If the distance between two charges is doubled, then the force of attraction or repulsion would
Double.
Quadruple
Reduce to half.
Reduce to ¼.

6. 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

7. Hair lost electrons Hair gained electrons Hair lost protons
If your comb becomes negatively charged when combing your hair then which of the following occurred?
Hair lost electrons
Hair gained electrons
Hair lost protons
Hair gained protons

8. One object has a charge of +3 C and the other is -7 C
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? -4 +4 +2 -2
-10
+10

9. The diagram below illustrates
Charging by friction
Charging by induction
Charging by conduction

10. Where is the electric force strongest on the test charge?+ Q A C B A B C

11. Right Left Zero Cannot be determined.
What is the resulting direction at point J of the electric fields created by both charges?
Right
Left
Zero
Cannot be determined.

12. 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.

13. What is the direction of the force on the negative charge in the figure?__ Up
Down
Left
Right
Into Page
Out of page

14. What is the direction of the force on the positive charge?Up
Down
Left
Right
Into Page
Out of page

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

16. A charge of -5x10-5 C is 50 cm from a 3x10-5 C charge
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

17. Moving electric charges are surrounded by
only electric fields.
only magnetic fields.
both magnetic and electric fields.
nothing.

18. The magnetic field lines about a current-carrying wire form
circles.
radial lines.
eddy currents.
spirals.

19. Which charge has the greatest field strength?
All are equal

20. A positive charge enters the magnetic field below
A positive charge enters the magnetic field below. The force on the charge is down. What is the direction of the velocity? Up
Left
Right
Out of page
Into Page
Force

21. A current carrying wire is placed in the magnetic field below
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 I Up
Down
Left
Right
Into page
Out of page

22. The Earth’s Magnetic North is located at
a. The South geographic pole
b. The North Geographic pole.
c. The equator.

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