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In a potentiometer experiment two cells ...

In a potentiometer experiment two cells of e.m.f. E and E are used in series and in conjunction and the balancing length is found to be 58 cm of the wire. If the olarity of E is reversed, then the balancing length becomes 29 cm . The ratio `(E_(1))/(E_(2))` of the e.m.f. of the two cells is

A

`1 : 1`

B

`3:1`

C

`5:1`

D

`7:1`

Text Solution

Verified by Experts

The correct Answer is:
D
According to the quation
`E_1 + E_2 prop 72 & E_1 - E_2 prop 54`
So `(E_1 + E_2)/(E_1 - E_2) = 72/54 = 4/3 implies (E_1)/(E_2) = 7/1`.
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