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A potentiometer circuit is shown in Figu...

A potentiometer circuit is shown in Figure 3 below. AB is a uniform metallic wire having length of 2m and resistance of `8Omega`. The batteries `E_(1) and E_(2)` have emfs of 4V and 1.5V and their internal resistances are `1Omega and 2Omega` respectively.

When the jockey J does not touch the wire AB, calculate:
the potential gradient across the wire AB

Text Solution

Verified by Experts

When jockey J does not touch the wire AB
Potential difference across wire AB, `V_(AB)= I_(1) xx 8`
`=0.25 xx 8= 2V`
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