A circular coil lies flat on a horizontal table. A bar magnet is held above its centre with its north pole pointing down. The stationary magnet induces (when viewed from above)Group of answer choicesno current in the coil.a clockwise current in the coil.a counterclockwise current in the coil.a current whose direction cannot be determined from the information given.
Question
A circular coil lies flat on a horizontal table. A bar magnet is held above its centre with its north pole pointing down. The stationary magnet induces (when viewed from above)Group of answer choicesno current in the coil.a clockwise current in the coil.a counterclockwise current in the coil.a current whose direction cannot be determined from the information given.
Solution
To determine the direction of the induced current in the coil, we need to apply Faraday's Law of Electromagnetic Induction and Lenz's Law.
- Faraday's Law states that a change in magnetic flux through a coil induces an electromotive force (EMF) in the coil.
- Lenz's Law states that the direction of the induced EMF (and hence the induced current) will be such that it opposes the change in magnetic flux that produced it.
Given the scenario:
- A circular coil lies flat on a horizontal table.
- A bar magnet is held above its center with its north pole pointing down.
- The magnet is stationary.
Since the magnet is stationary, there is no change in the magnetic flux through the coil. Faraday's Law tells us that an EMF is induced only when there is a change in magnetic flux. Therefore, no EMF is induced in this case.
As a result, there is no induced current in the coil.
So, the correct answer is:
- no current in the coil.
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