The length of a wire of a potentiometer is \( 100 \mathrm{~cm} \), and the e.m.f. of its standar...
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0The length of a wire of a potentiometer is \( 100 \mathrm{~cm} \), 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 is \( 0.5 \Omega \). If the balance point is obtained at \( l=30 \mathrm{~cm} \) from the positive end, the e.m.f. of the battery is
(A) \( \frac{30 E}{100} \)
(B) \( \frac{30 E}{100.5} \)
(C) \( \frac{30 E}{(100-0.5)} \)
(D) \( \frac{30(E-0.5 i)}{100} \)
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