Five small Identical metal balls are hung from insulating silk threads and are h

Question

Five small Identical metal balls are hung from insulating silk threads and are handled only by the threads. They are not allowed to touch one another during the following experiment. It has previously been found that of the balls are affected by a magnet. The balls are brought near each other, and the following observations are recorded: 1. Metal balls IV and II exert no force on each other. 2. Metal balls V and I repel each other. 3. other pairs of metal balls attract one another. For example, ball V attracts balls IV, III, and II. In which pairs of balls do both carry charge of the same sign? Determine for each of the following statements whether it is correct or incorrect. V and IV: IV and I: V and I: III and II: IV and II: Which of the following pairs contain one ball of each charge? Determine whether each statement is correct or incorrect. I and II: V and II: V and III: V and I: IV and III;

Explanation / Answer

The balls II and IV exert no force on each other hence they carry no charge

The balls V and I repel each other , hence they both carry same charge

So out of this five balls ball III has an opposite charge to that of ball I and V

For the first question answer is

Incorrect - V and IV

Incorrect - Iv and I

Correct - V and I

Incorrect - III and II

Incorrect - IV and II

For the second question the answer is

Incorrect - I and II

Incorrect - V and I

Correct - V and III

Incorrect - V and I

Incorrect - IV and III

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