| Same as problem 4 except the coil A is made to rotate about a vertical axis figure. No current flows in B if A is at rest. The current in coil A, when the current in B (at t = 0) is counter-clockwise and the coil A is as shown at this instant, t = 0, is |
 |
A) constant current clockwise.
B) varying current clockwise.
C) varying current counter-clockwise.
D) constant current counter-clockwise.
Correct Answer: A
Solution :
| Option [a] is correct |
| Explanation: In this case, the direction of the induced electromotive force/induced current is determined by the Lenz's law. According to the Lenz's law, the direction of induced emf or current in a circuit is such that it oppose \[\chi \]the cause that produces it. This lew is based upon law of conservation of energy. |
| When the current in coil B (at \[t\]=0) is counter- clockwise and the coil A is considered above it. The counter-clockwise flow of the current in coil B is equivalent to North Pole of magnet and magnetic field lines are eliminating upward to col A. When coil A is constant alongclockwise direction by Lenz's rule. |
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