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

R X ​ = 25 75 ​ = 3 R = A pl ​ = π d 2 4 pl ​ R ′ = π ( 2 d ​ ) 2 4 p ( 2 l ​ ) ​ = 2 R π ( 2 d ​ ) 2 then R ′ X ​ = ( l 100 − l ​ ) l 100 − l ​ = 2 R X ​ = 2 3 ​ l = 40.00 c m

Physics - Current Electricity Question with Solution | TestHub

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