In a meter bridge experiment S is a standard resistance. R is a resistance wire. It is found that balancing length is l = 25 c m . If R is replaced by a wire of hall length and half diameter that of R

Question

In a meter bridge experiment S is a standard resistance. R is a resistance wire. It is found that balancing length is l = 25 c m . If R is replaced by a wire of hall length and half diameter that of R of same material, then the balancing distance l ' (in c m ) will now be ______________.

TestHub · Accepted Answer

X R = 75 25 = 3 R = p l A = 4 p l π d 2 R ' = 4 p l 2 π d 2 2 = 2 R π d 2 2 then X R ' = 100 - l l 100 - l l = X 2 R = 3 2 l = 40.00 c m

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