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The uncharged metallic sphere \( \mathbf{A} \) suspended as shown in the given figure is given a push so that it moves towards the +ve plate. Which of the following statements is correct?

1. A touches the positive plate and remains in contact with it
2. A touches positive plate and then moves towards negative plate and remains in contact with it.
3. A moves to and fro between the two plates with a constant time period
4. A moves to and fro between the two plates with an increasing time period.

Correct answer: A touches positive plate and then moves towards negative plate and remains in contact with it.

Solution

When the neutral metallic sphere moves toward the positive plate, it is attracted by induction and on contact it acquires positive charge. A positively charged sphere is then repelled by the positive plate and attracted toward the negative plate, so it travels across and finally sticks to the negative plate after contact there.

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