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The balancing length on a potentiometer ...

The balancing length on a potentiometer wire with a cell of emf `2V` and internal resistance `1Omega` connected in the secondary circuit with no load is `200cm`. If a resistor of `19Omega` is connected parallel to the cell, the balancing length

A

decreases by `10%`

B

decreases by `20%`

C

decreases by `5%`

D

decreases by `10%`

Text Solution

Verified by Experts

The correct Answer is:
C
`r=[(l_(1)-l_(2))/(l_(2))]R`
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