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Physics · Electromagnetic induction: Faraday's law, induced emf and current, Lenz's law, eddy currents, self and mutual inductance

The diagram below show a coil connected to a centre zero galvanometer The galvan

The diagram below show a coil connected to a centre zero galvanometer \( G . \) The galvanometer shows a deflection to the right when the \( N \) -pole of a powerful magnet is moved to the right as shown. Does the direction of the current in the coil appear clockwise or anticlockwise viewed from this end \( A ? \)

  • A. The direction of induced current at end \( A \) is anti clockwise
  • B. The direction of induced current at end \( A \) is clockwise
  • C. The direction of induced current at end \( A \) is firsts clockwise and then anticlockwise
  • D. The direction of induced current at end \( A \) cannot be determined

Step-by-step solution

According to Lenz's law, the induced current opposes the change in magnetic flux. When the N-pole of the magnet moves to the right (towards end A of the coil), the flux through the coil increases. To oppose this, the induced current produces a magnetic field that repels the approaching N-pole, making end A a north pole. Using the right-hand rule, a clockwise current viewed from end A would produce a south pole, while an anticlockwise current produces a north pole. Therefore, the induced current must be anticlockwise as viewed from end A.
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