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A potentiometer wire has length 4 m and ...

A potentiometer wire has length `4 m` and resistance `8 Omega`. The resistance that must be connected in series with the wire and an accumulator of e.m.f. `2 V`, so as the get a potential gradient `1 mV` per cm` on the wire is

A

48 W

B

32 W

C

40 W

D

44 W

Text Solution

Verified by Experts

The correct Answer is:
B
`i = 2/(8 +R)`
`K = V_AB / L = 4/(8 + R) "Volt"/m = 40/(8 + R) mv/cm`
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