State ohm's law. write the necessary condition for its validity. how is this law verified experimentally? what will be the nature of graph between potential difference and current for a conductor? name the physical quantity that can be obtained from this graph.

Dear Student
Ohm's law states that at a constant temperature, current ‘I’ through a conductor between two points is directly proportional to the potential difference or voltage ‘V’, across the two points.
That is,   V = IR.

The necessary condition is that the temperature should be constant.

The nature of the graph is a straight line.

The physical quantity that can be determined is the gradient of the straight-line graph which is related to the resistance (R) of the conductor.

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