A positively charged insulating rod is placed on a balance. The reading on the balance is shown in diagram 1.
Two charged rods X and Y are now brought close to the positively charged rod in turn. Diagram 2 and diagram 3 show the new reading on the balance in each case.
Which row gives the charges on rod X and rod Y?
1 )
rod X: negative / rod Y: negative
2 )
rod X: negative / rod Y: positive
rod X: positive / rod Y: negative
4 )
rod X: positive / rod Y: positive
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