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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

2:5

c

5:3

d

3:1

answer is C.

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Detailed Solution

if wires are connected parallel current in them is inversely proportional to resistance I1:i2:i3=!R1:1R2:1R3=13:14:15=20 :12:15force on the middle wire from other two if x and y are the distances from themÎ¼020Ã152Ïx=Î¼012Ã152Ïy xy=1220=35

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