Question

Two coils of insulated copper wire are wound over a non conducting cylinder as shown. Coil 1 has comparative large number of turns. State your observations, when
1.Key is closed. 2. Key is opened
Give reason for each of your observations.

Answer 1

Explanation:

Reason: When key is open, magnetic field lines around coil 2 decreases momentarily. This causes an induced current to flow in opposite direction. Hence, deflection occurs in opposite direction. (ii) When current is passed continuously through coil I, no deflection is observed in the galvanometer.