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What do you mean by thermoelectric effect?

With the help of a circuit diagram describe the method to find the internal resistance of a cell using potentiometer.

State principle of potentiometer.

State principle of meter bridge. Describe how it is used to determine the resistance of a wire.

State and apply krichoff's rule to measure the unknown resistance of a wire by using wheatstone bridge circuit.

how can you convert galvanometer into voltmeter and ammeter

Describe Young's double slit experiment and show that the bright fringe and dark fringe are equally spaced.