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In a potentiometer of one metre length, ...

In a potentiometer of one metre length, an unknown emf voltage source is balanced at `60 cm` length of potentiometer wire, while a `3` volt battery is balanced at `45 cm` length. The the emf of the unknown voltage source is.

A

3V

B

2.25V

C

4 V

D

4.5 V

Text Solution

Verified by Experts

The correct Answer is:
C
`E_(1)/E_(2)= I_(1)/I_(2) rArr E/3 = 60/45 rArr E = (60 xx 3)/45 = 4` volt
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