Q. 15.0( 4 Votes )

A potentiometer w

Answer :

To find: the EMF of a primary cell 'e' which gives a balance point of 40 cm.

Resistance of potentiometer = R = 10 ohms

External battery has voltage = V = 6 V

Resistance in series = r = 5 ohms

Length of the potentiometer wire = L = 100

Equivalent resistance = R + r

Total current flowing through circuit = I

Using Ohm's law,

Let voltage potentiometer

Again using Ohm's law,

We know,

l = length across which e gives a balance point

Where k is the potential gradient


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