Question

In a potentiometer experiment, for measuring internal resistance of a cell, the balance point has been obtained on the fourth wire. The balance point can be shifted to fifth wire by ______.

Options

• putting a suitable resistance in series with the cell

• putting a shunt resistance in parallel with the cell

• increasing the current due to auxiliary battery

• decreasing the current due to auxiliary battery

Answer 1

In a potentiometer experiment, for measuring internal resistance of a cell, the balance point has been obtained on the fourth wire. The balance point can be shifted to fifth wire by decreasing the current due to auxiliary battery.

Explanation:

If the current due to the auxillary battery is decreased, the potential gradient will be decreases, so the balancing length increases.
Thus, null point will move to fifth wire.