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 360cm. The unknown resistance R is

Options

A. 2.4 ohm
B. 3.0 ohm
C. 3.6 ohm
D. 6.6 ohm

Answer

A

Explanation

`i2=x 300....(1)`
`iR=x 360 ....(2)`
`R= 2.4 Omega`