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 is $$0.5$$ Ω. If the balance point is obtained at l $$=$$ $$30$$ cm from the positive end, the e.m.f. of the battery is

Question

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 is $$0.5$$  Ω.  If the balance point is obtained at l $$=$$ $$30$$ cm from the positive end, the e.m.f. of the battery is

Infinity Learn · Accepted Answer

From the principle of potentiometet, V  ∝   l⇒  VE  $$=$$  lL  ;  where V $$=$$ emf of battery E $$=$$ emf of standard cell, L $$=$$ Length of potentiometer $$wireV=$$  ElL  $$=$$  $$30E100$$

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 is $0.5 Ω$ . If the balance point is obtained at l = 30 cm from the positive end, the e.m.f. of the battery is

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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 is 0.5 Ω. If the balance point is obtained at l = 30 cm from the positive end, the e.m.f. of the battery is

Remember concepts with our Masterclasses.

Ready to Test Your Skills?

free study material

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 is $0.5 Ω$ . If the balance point is obtained at l = 30 cm from the positive end, the e.m.f. of the battery is