Two coils A and B are placed as shown in Fig. The coil A is connected

1.	Two coils A and B are placed as shown in Fig. The coil A is connected to a battery and a key K while the coil B is connected to a center zero galvanometer G.What will you observe in the galvanometer G when 1. the key K is closed. 2. the key K is opened. 3. with the key K closed, the coil A is move rapidly towards the coil B. 4. with the key K closed, the coil B is moved rapidly towards the coil A. 5. with the key K closed, the coils A and B are moved away from each other?
Answer» 1. As the key K is closed, a deflection is observed in the galvanometer for a short while (i.e. a momentary deflection). In other words, the galvanometer needle deflects for a moment and returns to zero. 2. As the key K is opened, again a momentary deflection (but more) is observed in the opposite direction. 3. With the key K closed, if the coil A is moved rapidly towards the coil B, a deflection is obtained in the galvanometer in the direction as in due to increase in magnetic flux through the coil B. But the deflection lasts so long as the coil A moves. 4. With the key K closed, if the coil B is moved rapidly towards the coil A, again a deflection is observed in the galvanometer in direction as in due to increase in magnetic flux through the coil B. The deflection lasts so long as the coil B moves. 5. With the key K closed, if the coil A and B are moved away from each other, a deflection is observed in the galvanometer in direction as in due to decrease in magnetic flux through the coil B. The deflection lasts so long as there is relative motion between the coils.

Two coils A and B are placed as shown in Fig. The coil A is connected to a battery and a key K while the coil B is connected to a center zero galvanometer G.What will you observe in the galvanometer G when 1. the key K is closed. 2. the key K is opened. 3. with the key K closed, the coil A is move rapidly towards the coil B. 4. with the key K closed, the coil B is moved rapidly towards the coil A. 5. with the key K closed, the coils A and B are moved away from each other?

Answer»

1. As the key K is closed, a deflection is observed in the galvanometer for a short while (i.e. a momentary deflection). In other words, the galvanometer needle deflects for a moment and returns to zero.

2. As the key K is opened, again a momentary deflection (but more) is observed in the opposite direction.

3. With the key K closed, if the coil A is moved rapidly towards the coil B, a deflection is obtained in the galvanometer in the direction as in

due to increase in magnetic flux through the coil B. But the deflection lasts so long as the coil A moves.

4. With the key K closed, if the coil B is moved rapidly towards the coil A, again a deflection is observed in the galvanometer in direction as in

due to increase in magnetic flux through the coil B. The deflection lasts so long as the coil B moves.

5. With the key K closed, if the coil A and B are moved away from each other, a deflection is observed in the galvanometer in direction as in

due to decrease in magnetic flux through the coil B. The deflection lasts so long as there is relative motion between the coils.

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