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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 potentiometer of length 1 m and and resistance 5Ω the value of R, to give a difference of 56mV across 10 cm of potentiometer wire , is :

A

`490 omega`

B

`480 omega`

C

`395 omega`

D

`495 omega`

Text Solution

Verified by Experts

The correct Answer is:
C
Potential gradient `=(5xx10^-3)/(10xx10^-2)=((4)/(R+5)xx5)`
`rArr (1)/(20)=(20)/(R+5)`
`rArr 400=R+5`
`rArr 395 Omega`.
.
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