A positively charged ball and a neutral metal rod are hanging close to each othe

Question

A positively charged ball and a neutral metal rod are hanging close to each other but do not touch. A positively charged rod is brought close to the end of the metal rod that is opposite to the ball.

Two students are having a discussion about whether the hanging rod will be attracted to or repelled by the sphere.

Student A: The hanging rod will be repelled by the sphere and the rod. Both the hanging sphere and the other rod are positively charged. The electrons in the hanging rod will be repelled by both of them and will collect in the center of the hanging rod leaving both ends positively charged. Hence the hanging rod will be repelled by both of them.

Student B: No, the electrons in the hanging rod will be attracted to both the sphere and the other rod since opposite charges attract. So the hanging rod will be attracted to both of them.

Which student do you agree with and why? Discuss all parts of the statements made by both students and explain where the reasoning is right or wrong. Be sure to address all parts of both statements. If you do not agree with any of them then explain what will happen in this situation.

Explanation / Answer

Student A is correct. when the charged rod touch with hanging rod then the hanging rod also got positively charged. Because the high density positive charge goes to neutral hanging rod. So now hanging rod and hanging sphere are positively charged. So hanging rod will be repelled by the sphere.

Student B is rong. Hanging rod have electrons but that also have positive charge. So his answer is rong.

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