The length of a wire of a potentiometer is 100 cm, and the e. m. f. of its standard cell is E volt. It is employed to measure the e.m.f. of a battery whose internal resistance in 0.5Ω. If the balance point is obtained at 1=30 cm from the positive end, the e.m.f. of the battery is where i is the current in the potentiometer wire.

(D) 30E/100 - 0.5i, where i is the current in the potentiometer wire

Current Electricity: JEE Main 2003 Physics question

JEE Main 2003 · Annual, Paper 1 · Q6499

JEE Main 2003Annual, Paper 1PhysicsMediumCurrent Electricity150× since 2002

The length of a wire of a potentiometer is

100

cm

, and the

e.

m.

f.

of its standard cell is

E

volt. It is employed to measure the

e.m.f.

of a battery whose internal resistance in

0.5\Omega .

If the balance point is obtained at

1=30

cm

from the positive end, the

e.m.f.

of the battery is where

i

is the current in the potentiometer wire.

JEE Main 2003 Current Electricity Question with Solution (Annual Paper 1, Q6499) | JEE Arc