Solution
verified
Verified by Toppr
Precautions with Potentiometer:
1. emf of the cell connecting in primary circuit must be more than or equal to the emf of the cell of secondary circuit otherwise zero deflection can not be obtained.
2. All the high potential points or positive terminals should be connected at A
3. Balancing length should be calculated from A
4. Area of cross-section of the wire should be uniform otherwise potential gradient will not be constant.
5. Current should not be passing through potentiometer wire for a long time otherwise this will heat up the wire and will changes its resistance and hence potential gradient will also changed.