The length of a wire of a potentiometer is \( 100 \mathrm{~cm} \) and the emf of its standard ce...

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The length of a wire of a potentiometer is \( 100 \mathrm{~cm} \) and the emf of its standard cell is E volts. It is
P employed to measure the e.m.f. of a battery whose W internal resistance is \( 0.5 \Omega \). If the balance point is obtained at \( \ell=30 \mathrm{~cm} \) from the positive end, the e.m.f. of the battery is :-
(1) \( \frac{30 E}{100} \)
(2) \( \frac{30 E}{100.5} \)
(3) \( \frac{30 E}{(100-0.5)} \)
(4) \( \frac{30(E-0.5)}{100} \)
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