Saved Bookmarks
| 1. |
A coil Q is connected to low voltage bulb B and placed near another coil P as shown in the Fig. 6.46. Give reasons to explain the following observations: (a) The bulb 'B' lights. (b) Bulb gets dimmer if the coil Q is moved towards left. |
|
Answer» Solution :(a) The bulb B lights due to the mutual inductance phenomenon. On passing alternating current through COIL P, magnetic flux of coil P continuously CHANGES with TIME. As coil Q is placed near the coil P, hence due to change in magnetic flux of coil P the magnetic flux of coil Q also correspondingly changes. As a result an alternating voltage is induced across the coil Q, due to which the bulb B starts glowing. (b) If the coil Q is moved towards left (i.e., away from the coil P), the coupling between the COILS Pand Q becomes loose. It means that flux lines passing through coil Q will be lesser and so the induced voltage across it will be less. Hence, the bulb B gets dimmer. |
|