Question

50. A potentiometer consists of a wire of
length 4 m and resistance 10 12. It is
connected to a cell of emf 2 V. The potential
gradient of the wire is
(a) 0.5 V/m
(b) 2 V/m
(c) 5 V/m
(d) 10 V/m​

Answer 1

Answer:

Current, I=E/R=3/10

Potential across the potentiometer wire is: V

p

=10I=3V

Potential gradient is: k=

l

V

p

=3/4=0.75 V/m

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Answer 2

The potential gradient of wire is. ... a wire of length 4m and resistance 10Ω. It is connected to a cell of e.m.f. 3V. ... 2 V/m.

Current, I = E/R = 3/10 Potential across the potentiometer wire is: Vp = 10I = 3 V Potential gradient is: k = Vpl = 3/4 = 0.75 V/m

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