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AN ideal battery of 4 V and resistance...

AN ideal battery of 4 V and resistance R are connected in series in the primary circuit of a notentiometer of length 1 m and the value of R, to give a differeence of 56mV across 10 cm of notentiometer wire , is :

A

`490 Omega`

B

`480 Omega`

C

`395 Omega`

D

`495 Omega`

Text Solution

Verified by Experts

Potential gradient =`(5 times 10^-3)/(10 times 10^-2)=(4/(R+5) times 5)`
`implies 1/20=20/(R+5)`
`implies 400=R+5 implies 395 Omega`
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