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An unknown resistance R is connected in ...

An unknown resistance R is connected in series with a 2-ohm resistance. A current is flowing in this combination. The balancing length for potential difference across 2-ohm resistor, in a potentiometer experiment is found to be 300 cm, while the balancing length for the potential difference across the unknown R is found to be 360 cm. The unknown resistance R is

A

2.4 ohm

B

3.0 ohm

C

3.6 ohm

D

6.6 ohm

Text Solution

Verified by Experts

The correct Answer is:
A
`i2=x 300....(1)`
`iR=x 360 ....(2)`
`R= 2.4 Omega`
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