Select the answers which complete the statements below (e.g., if answer A comple

Question

Select the answers which complete the statements below (e.g., if answer A completes the first statement, and answer B the others, enter ABBBB).

A) positive B) negative C) neutral D) cannot tell

i) A positive point charge is brought near the outside surface of a neutral conducting sphere and released. The initial position of the point charge is on the positive x axis and the sphere is centred on the origin. The point charge moves in the ____ x direction. (If the point charge does not move, select answer C.)

ii) A negatively charged glass rod attracts an object suspended by a non-conducting thread. The charge on the object is

iii) A negatively charged glass rod repels an object suspended by a non-conducting thread. The charge on the object is ____

iv) Two neutral metal spheres are mounted on insulating supports. They are connected by a wire. A positively charged glass rod is brought near sphere 1. The wire connecting the spheres is removed and the charged rod is then taken away. Now the charge on sphere 2 is ____

v) A positively charged ball is brought close to a neutral isolated conductor. The conductor is then grounded, while the ball is kept close. If the ball is first taken away and then the ground connection is removed, the conductor has a ____ charge.

Explanation / Answer

I disagree with you on iii) and v).

For iii), when the ground wire is removed and the charged rod is removed, there will be a net negative charge on the spheres. This will be divided between the 2 spheres (if they are the same size, they will become equally negative). So I would choose answer B.

For v) you should remember that neutral objects are attracted to charges (e.g. picking up small pieces of tissue paper with charged plastic). This is because the neutral object (an insulator or an isolated conductor) becomes slightly polarised with one side positive and the other side negative. So you can't tell if the object is positive or neutral.

ABBBD

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