First slide

potentiometer

Question

A potentiometer is used for the comparison of e.m.f. of two cells E₁ and E₂. For cell E₁ the no deflection point is obtained at 20 cm and for E₂ the no deflection point is obtained at 30 cm. The ratio of their e.m.f.'s will be

Easy

A

2/3
B

1/2
C

1
D

2

Solution

Ratio will be equal to the ratio of no deflection lengths. Hence, $\frac{E_{1}}{E_{2}} = \frac{l_{1}}{l_{1}} = \frac{2}{3}$

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