If a free electron is placed midway between a positive charge and a negative cha

Question

If a free electron is placed midway between a positive charge and a negative charge of equal magnitude, the electron will; a) Move toward the negative charge, b) remain stationary, c) move toward the positive charge. When a hard rubber rod is rubbed with fur, the rod is negatively charged because; a) Protons are transferred to the fur. b) There is charging by induction. c) Electrons are transferred to the rod from the fur. Electrostatic charges can be placed on an object by; a) friction, b) contact c) induction, d) all of these The conservation of charge states that the total charge of an isolated system is a) zero, b) greater than zero, c) constant. The electric field at a point 'P', a distance 'r' from a point charge is proportional to; a) r, b) 1/r^2, c) 1/r, d) r^2. The SI unit of electric force is; a) newton/coulomb, b) newton, c) coulomb The electric field produced by an electric charge; a) has magnitude only, b) is a vector quantity, c) is measured in coulombs, d) has only direction. Which of the following is not a fundamental property? a) mass, b) electric charge, c) electric force, d) time. The unit of electric charge is; a) newton, b) newton/coulomb, c) coulomb. Two positive electric charges repel with a force of '4.0 N'. If the distance of separation is cut in half, the repulsive force will; a) double, b) cut in half, c) quadruple, d) be none of the above. At what distance of separation will two charges, each of magnitude '6 mu C' exert a force of '1.2 N' on each other? For the group of charges shown below, find the magnitude and direction of the net electrostatic force on charge 'q'. a) Charges are located as shown. Find the magnitude and direction of the electric field at the origin. b) If a charge 'q = 4 nC' is placed at the origin, find the magnitude and direction of the force on this charge.

Explanation / Answer

1) a) move towards the negative charge

2) c) the electrons are transferred to the rod from the fur

3) d) all of these

4) c) constant

5) b) 1/r^2

6) a) newton/coulomb

7) b) is vector quantity

8) c) electric force

9) c) coulomb

10) c) quadrupole

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