CBSE Class 12 Physics 2014 Outside Delhi Set 1 Paper

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Question : 5
Total: 30
The electric current flowing in a wire in the direction from B to A is decreasing. Find out the direction of the induced current in the metallic loop kept above the wire as shown.
Solution:  
The magnetic field due to the wire in the coil in going into the paper. So, according to Lenz's Law, if magnetic field going inside is decreasing as the current is decreasing, the direction current in the loop should be such that the magnetic field into the paper increases. Therefore, the current should be in clockwise direction.
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