Question

17. A cell in secondary circuit gives null deflection for 2.5 m
length of potentiometer having 10 m length of wire.
If the length of the potentiometer wire is increased
by 1 m without changing the cell in the primary, the
position of the null point now is .
(a) 3.5 m (b) 3 m (c) 2.75 m
(d) 2.0 m​

Answer 1

Answer:c

Explanation:

From the Principle of potentiometer vαl For 10m long potentiometer wire, the balancing length is 2.5m For 11m long potentiometer wire, the balancing length is (11(2.5))/10 = 2.75m