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A potentiometer PQ is set up to comapre ...

A potentiometer PQ is set up to comapre two resistances as shown in the figure. The ammeter A in the circuit reads 1.0 A when two way key `K_(3)` is open. The balance point is at a length `l_(1)` cm from P when two way key `K_(3)` is plugged in between 2 and 1, while the balance point is at a length `l_(2)` cm from P when key `K_(3)` is plugged in between 3 and 1. The ratio of the two resistance `(R_(1))/(R_(2))`, is found to be-

A

L1 / L1 - L2

B

L2 / L2 - L1

C

L2 / L1 + L2

D

L1 / L2 + L1

Text Solution

Verified by Experts

The correct Answer is:
C
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