A potentiometer wire is 5 m long and a potential difference of 6V is maintained between its ends. Find the emf of a cell which balance against a length of 180 cm of the potentiometer wire.

A potentiometer wire is 10 meter long and a potential difference of 6 volt is maintained between its ends. Find the e.m.f. of a cell which balances a length of 180 cm of the potentiometer wire.

A potentiometer wire is 500 cm long and potential difference of 4 V is maintained between the ends of the wire. The e.m.f. of the cell which balances against the length of 135 cm of the wire is

A potentiometer wire is 10 m long and a P.D. of 6 V is maintained between its ends. The e.m.f. of the cell which balances against a length of 200 cm of the potentiometer wire is