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The balancing lengths on a potentiometer...

The balancing lengths on a potentiometer wire are `800cm` and `600cm` when two cells of emfs `E_(1)` and `E_(2)` are connected in the secondary circuit first to help each other and next to oppose each other, then `(E_(1))/(E_(2))=`

A

`1//11`

B

`14//11`

C

`7//1`

D

`4//3`

Text Solution

Verified by Experts

The correct Answer is:
C
`(E_(1)+E_(2))/(E_(1)-E_(2))=(l_(1))/(l_(2))implies(E_(1))/(E_(2))=(l_(1)+l_(2))/(l_(1)-l_(2))`
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