Question

Two cells of emfs approximately 5 V and 10 V are to be
accurately compared using a potentiometer of length 400
cm.
(a) The battery that runs the potentiometer should have
voltage of 8V
(b) The battery of potentiometer can have a voltage of 15
V and R adjusted so that the potential drop across the
wire slightly exceeds 10 V
(c) The first portion of 50 cm of wire itself should have a
potential drop of 10 V
(d) Potentiometer is usually used for comparing resistances
and not voltages

Answer 1

Answer:

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Answer 2

Answer:

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