Download Name Date Per ______ Physics – Std 5e: Electrostatics and

Name ________________________________________ Date _____________________ Per _________
Physics – Std 5e: Electrostatics and Currents Review
1. A positive ion has more:
(a) electrons than neutrons (b) electrons than protons (c) protons than electrons (d) protons than
neutrons (e) neutrons than protons
2. To say that electric charge is conserved is to say that electric charge:
(a) may occur in an infinite variety of quantities (b) is a whole number multiple of the charge of
one electron (c) will interact with neighboring electric charges (d) can be neither created nor
destroyed.
3. Strip electrons from an atom and the atom becomes a:
(a) positive ion (b) negative ion (c) different element
4. To say that electric charge is conserved is to say that electric charge:
(a) may occur in an infinite variety of quantities (b) is a whole number multiple of the charge of
one electron (c) will interact with neighboring electric charges (d) can be neither created nor
destroyed
5. The electrical force between charges depends on the:
(a) magnitude of electric charges (b) separation distance between electric charges (c) both of
these (d) none of these
6. Rub electrons from your hair with a comb and the comb becomes:
(a) negatively charged (b) positively charged
7. Two protons attract each other gravitationally and repel each other electrically. By far the greater
is:
(a) the gravitational attraction (b) the electrical repulsion (c) neither - they are the same
8. The net charge on a charged capacitor:
(a) depends on the area of the capacitor plates (b) depends on the distance between the capacitor
plates (c) depends on the medium between the capacitor plates (d) all of these (e) none of these the net charge is zero
9. If you comb your hair and the comb becomes positively charged, then your hair becomes:
(a) positively charged (b) negatively charged (c) uncharged
10. A difference between electric forces and gravitational forces is that electrical forces include:
(a) separation distance (b) repulsive interactions (c) the inverse square law (d) infinite range (e)
none of these
11. A conductor differs from an insulator in that a conductor:
(a) has more electrons than protons (b) has more protons than electrons (c) has more energy than
an insulator (d) has faster moving molecules (e) none of these
12. A negatively charged rod is brought near a metal can that rests on a wood table. You touch the
opposite side of the can momentarily with your finger. The can is then:
(a) positively charged (b) negatively charged (c) uncharged (d) charged the same as it was
13. To be safe in the unlikely case of a lightning strike, it is best to be inside a building framed with:
(a) steel (b) wood (c) both the same
14. Two charges separated by one meter exert 1N forces on each other. If the charges are pushed
to1/4 meter separation, the force on each charge will be:
(a) 1 N (b) 2 N (c) 4 N (d) 8 N (e) 16 N
15. Two charges separated by one meter exert 1N forces on each other. If the charges are pulled to
3m separation distance, the force on each charge will be:
(a) 0.33 N (b) 0.11 N (c) 0N (d) 3 N (e) 9 N
16. Two charges separated by one meter exert 1N forces on each other. If the magnitude of each
charge is doubled, the force on each charge is:
(a) 1 N (b) 2 N (c) 4 N (d) 8 N (e) none of these
17. Two charged particles repel each other with a force F. If the charge of one of the particles is
doubled and the distance between them is also doubled, then the force will be:
(a) F (b) 2 F (c) F/2 (d) F/4 (e) none of these
18. Two charged particles attract each other with a force F. If the charges of both particles are
doubled, and the distance between them also doubled, then the force of attraction will be:
(a) F (b) 2 F (c) F/2 (d) F/4 (e) none of these
19. The electric field inside an uncharged metal ball is zero. If the ball is negatively charged, the
electric field inside the ball is then:
(a) less than zero (b) zero (c) greater than zero
20. Two charged particles held close to each other are released. As they move, the force on each
particle increases. Therefore, the particles have:
(a) the same sign (b) opposite signs (c) not enough information given
21. Draw the lines of force representing the electric field around two charges if both charges are
negative and of the same magnitude.
22. Draw the lines of force representing the electric field around two charges if both charges are
positive and one has twice the charge of the other one.
23. Draw the lines of force representing the electric field around two charges if both charges are
opposite and of the same magnitude.