A steady voltage drop is maintained across a potentiometer wire which is 5m long. A Daniel cell is balanced by a length of 3m of wire. If length of potentiometer wire is increased to 6 m, find new length of wire across which Daniel cell will be balanced.

Options

A. 3.6m
B. 6.6m
C. 6.3 m
D. 3.3m

Answer

A

Explanation

`(E_(1))/(l_(1))=I rho = (V)/(L)`
`:.(V)/(E)=(L)/(l_(1))=I rho = ` constant
`:.(l_(1.2))/(l_(1.1))=(L_(2))/(L_(1)) " " :.l_(1.2)=3.6m`