Questions
An Edison cell and a Iead accumulator when placed in series produce a null deflection at a distance 204 cm in a potentiometer. But when placed in opposition produces null deflection. at a distance of 36 cm. If the e.m.f. of Edison cell is 1 . 4 V, the e.m.f. of lead accumulator is
detailed solution
Correct option is A
E1E2=l1+l2l1−l2 or E11⋅4=204+36204−36=2VTalk to our academic expert!
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The length of potentiometer wire is 100 cm and the emf of its standard cell is E volts. It is employed to measure the emf of a battery whose internal resistance is 0.5 ohm. If the balance point is obtained at l = 30 cm from positive end, the emf of the battery is
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