Use of potentiometer to measure the internal resistance of a cell. (i) When the key K is open, how does the balance point change,if the current from the driver cell decreases ? (ii) When the key K is closed, how does the balance point change if R us increased, keeping the current from the driver cell constant ?
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(i) When the current from the driver cell decrease in potentiometer wire, the potential gradient across the wire decreases. Due to it, the balance point is obtained on longer length of potentiometer wire. (ii) When key K is closed and the value of R is increased, the lesser current will be drawn from the cell E'. Terminal voltage of cell E' will increase, therefore, the balance point will be obtained on longer length of potentiometer wire.
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