Question

OR
Name the two coils, coil 1 and coil 2 present in the diagram.
(a) Explain the observations of the reading in the galvanometer when
fi) The key is closed
(ü) The key is open
(iii) Current of 5A is flowing steadily in coil 1.
(b)Name and state the phenomena responsible for the above observation.​

Answer 1

(i) When key is pressed on, the galvanometer needle deflects momentarily in one direction.

(ii) When the current in the coil C1 is switched off, the galvanometer needle deflects again  momentarily but in opposite direction to that in the previous case.

(iii) When current is passed continuously through coil C1, no deflection is observed in the galvanometer.

(iv) The phenomenon responsible for the above observations is electromagnetic induction.