For what value of R, current in the galv...

For what value of `R`, current in the galvanometer is zero ?

`1 Omega`

`2 Omega`

`5 Omega`

`7 Omega`

Text Solution

Verified by Experts

The correct Answer is:

(a) Potential difference across resistance `R` equal `2 V` with polarity as shown.
Hence, current `i= (12 - 2)/(5) = 2 A`
So, `2 xx R = 2`
`R = 1 Omega`
- ve sign indicates that current flows in opposite direction

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