Question

Two circular coils-1 and coil-2 are kept close to each other as shown in the diagram.Coil-1 is connected to a battery and key and coil-2with a galvanometer. State your observation in the galvanometer: When key k closed ; (b) when key k is opened; Give reason for your observations.

Answer 1

When key is closed galvanometer will show a momentary deflection due to produce of induced current due to change in magnetic field lines.

And when key is opened again a momentary deflection will be seen but at opposite direction due to again a change in magnetic fields..

Hope it helps u....

Answer 2

When the key connected to coil-1 is closed or opened, the galvanometer connected to coil-2 will show deflection.

• When the key connected to coil-1 is closed, the current starts flowing through the coil.
• This current produces flux and this flux gets linked with the coil-2.
• Since the flux linked with coil-2 will changes, an emf is induced for a moment in coil-2 which sets a momentary current in coil-2 and hence, causes the galvanometer to deflect.
• Since the flux linked with coil-2 becomes constant afterward, the galvanometer comes to zero.
• Again when the key is opened, the current in coil-1 becomes zero changing the flux to zero.
• This changes the flux linked with coil-2 and again causes a momentary deflection in the galvanometer.