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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 the value of 5 ohm, to give a difference of 5mV across 10 cm of potentiometer wire , is :

A

`490Omega `

B

`480Omega `

C

`396Omega `

D

`495Omega `

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