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Figure shows the circuit of a potentiome...

Figure shows the circuit of a potentiometer. The length of the potentiometer wire AB is 50 cm. The emf of the battery E, is 4 volt having negligible internal resistance. Values of resistances `R_(1)` and `R_(2)` are `15` ohm and `5` ohm respectively. When both the keys are open, he null point is obtained at a distance of `31.25` cm from end A but when both the keys are closed, the balance length reduces to 5 cm only `R_(AB) = 10 Omega `

The emf of the cell `E_(2)` is

A

`4.5Omega`

B

`5.5 Omega`

C

`6.5 Omega`

D

`7.5 Omega`

Text Solution

Verified by Experts

The correct Answer is:
D
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