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Q.

Three long straight wires are connected parallel to each other across a battery of negligible internal resistance. The ratio of their resistances are 3 : 4 : 5. What is the ratio of distances of middle wire from the others if the net force experienced by it is zero

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a

4 : 3

b

3 : 1

c

5 : 3

d

2 : 3

answer is C.

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Detailed Solution

The wires are in parallel and ratio of their resistances are 3 : 4 : 5, Hence currents in wires are in the ratio Force per unit length between top and middle wire . Force between bottom and middle wire .As the forces are equal and opposite so

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