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A cell of e.m.f. 2 V and negligible inte...

A cell of e.m.f. 2 V and negligible internal resistance is connected to a potentiometer wire of resistance `10 Omega` and length 4 m. The potential difference per unit length (potential gradient ) of the wire is

A

5 volt / metre

B

10 volt / metre

C

0.5 volt / metre

D

1.5 volt / metre

Text Solution

Verified by Experts

The correct Answer is:
C
`I=(2)/(10)=0.2 A`
`therefore (V)/(L)=(IR)/(L)=0.2xx(10)/(4)=0.5 V//m`
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