State the underlying principle of a transformer.

The circuit arrangement given in the figure shows that when an ac. passes through the coil A, the current starts flowing in the coil B. State the underlying principle involved.

State the principle of optical pipe.

State the principle of a potentiometer.

What is the principle of a transformer ? Explain the theory and its application for long distance transmission of electrical energy.

State and explain principle of dominance?

State Le Chatelier’s principle.

State Le Chatelier’s principle.

Give the principle of a transformer, construction of a stepdown transformer. Give any two energy losses of a transformer.