Question

Find the true statement.

(a) The relative motion between the coils was not compulsory for the current in the primary to be generated

(b) The direction of deflection of the pointer does not depend upon the direction of motion of the secondary coil towards or away from the primary coil in the second experiment

(c) When the south-pole of the bar magnet is moved towards or away from the coil, the deflections in the galvanometer are same to that observed with the north-pole for similar movements

(d) There is a difference in effect when the bar magnet is kept stationary and the coil is in motion

I have been asked this question during an online exam.

This interesting question is from Faraday and Henry Experiments in chapter Electromagnetic Induction of Physics – Class 12

Answer 1

The correct option is (a) The relative motion between the coils was not compulsory for the current in the primary to be generated

For explanation I would say: The relative motion between the coils was not really necessary for the current in the primary to be generated. In the third experiment, Faraday placed two stationary coils and connected one of them to the galvanometer and the other to a battery, through a push button. As the button was pressed, the galvanometer in the other coil showed a deflection, indicating the presence of current in that coil. All the other statements are not valid.