Two coils are suspended around a common central axis as shown. One of the coils

Question

Two coils are suspended around a common central axis as shown. One of the coils is connected to a resistor R with ends labeled a and b. The other coil is connected to a battery through a switch S. of a lane the a R b Assume these are ideal coils and use Lenz's law to determine the correct statements for the following: The direction of the magnetic field in the coils after the switch is closed for a long period of time is unter- ckwise A1: right to left (? B); A2: left to right (B) After switch S has been closed for a long period of time, the switch is opened. The di- rection of the internal induced magnetic field wedby the larger diameter (secondary) coil just hile the after the switch is opened is B1 : left to right (Binduced );

Explanation / Answer

3) A2, B1, C1 is the correct answer.

When switch is closed the direction f magnetic field is from left to right.

When the switch os opened the direction of induced magnetic field should be same as the earlier magnetic field in the coil.

so, the direction of Binduced must be from left to right.

so, induced current flows a to b.

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