Physics, 22.01.2020 06:32 potato1458

When a test charge is brought near a charged object, we know from coulomb's law that it will experience a net force (either attractive or repulsive, depending on the nature of the object's charge). a test charge may also experience an electric force when brought near a neutral object. any attraction of a neutral insulator or neutral conductor to a test charge must occur through induced polarization. in an insulator, the electrons are bound to their molecules. though they cannot move freely throughout the insulator, they can shift slightly, creating a rather weak net attraction to a test charge that is brought close to the insulator's surface. in a conductor, free electrons will accumulate on the surface of the conductor nearest the positive test charge. this will create a strong attractive force if the test charge is placed very close to the conductor's surface.
1. what is the nature of the force between balls a and b?
a) strongly attractive.
b) strongly repulsive.
c) weakly attractive.
d) neither attractive nor repulsive.
2. what is the nature of the force between balls a and c?
a) strongly attractive.
b) strongly repulsive.
c) weakly attractive.
d) neither attractive nor repulsive .

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