IBDP Physics Question Analysis Topic: Physics - Short Questions
1) A bar magnet is moved in the direction indicated by the arrow between two coils PQ and CD. Predict the direction of the induced current in each coil.
2) The figure given above shows the block diagram of a generalized communication system. Identify the element labeled 'X' and write its function.
1) Lenz's law states that the induced emf's direction opposes the change in magnetic flux that caused it to be produced.
The right end of the coil will generate a south pole, or an induced current that is observed from the left end will be anticlockwise, because the bar magnet's north pole is moving away from the coil.
Again, because the south pole is pushing towards the second coil, the coil's left end will produce a south pole to repel it and reduce the flux, causing the induced current to flow clockwise as seen from the left end.
2) The 'X' is known as the 'channel' element. The channel's job is to connect the transmitter and the receiver. A channel can be wired or wireless, depending on how the transmitter and receiver are connected.
End of analysis. Great!