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Five Styrofoam balls are suspended from ...

Five Styrofoam balls are suspended from insulating threads. Several experiments are performed on the balls and the following observations are made:
(i) Ball A repels C and attracts B.
(ii) Ball D attracts B and has no effect on E.
(iii) A negatively charged rod attracts both A and E.
An electrically neutral Styrofoam ball gets attracted if placed nearby a charged body due to induced charge. What are the charges, if any, on each ball A,B,C,D, and E?

A

`+, -, + , 0, + `

B

`+, -, +, +, 0`

C

`-, +, - , 0, 0`

D

`+, - , +, 0, 0`

Text Solution

Verified by Experts

The correct Answer is:
D
Ball `D` has no effect on `E`, it means both `D` and `E` should be neutral.

`A` repels `C`, so both should have similar type of charge. Negatively charged rod attracts `A`, so `A` should have positive charge. So `C` should also have positive charge.
`A` attracts `B`, is either negatively charged or has no charge. But `B` attracts `D` which is uncharged, so `B` should have negative charge.
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