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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

4V

D

`4.5V`

Text Solution

Verified by Experts

The correct Answer is:
C
`(E_(1))/(E_(2))=(x_(1))/(x_(2)) rArr (E_(1))/(3)=(60)/(45)`
`E_(1)=4V`
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