📚 Learning Guide
Electric Field Induction Extension
easy

If a magnet is moved toward a coil of wire, what will happen to the electric current in the wire according to Faraday's Law of Electromagnetic Induction?

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Choose the Best Answer

A

The current will be induced in the wire.

B

The current will decrease.

C

The current will remain unchanged.

D

The current will reverse direction.

Understanding the Answer

Let's break down why this is correct

Answer

When a magnet approaches a coil, the magnetic field through the coil changes, which according to Faraday’s Law creates an electromotive force in the wire. This force drives electrons, producing an electric current whose direction is chosen so that the coil’s magnetic field opposes the increase of flux, as Lenz’s Law states. Thus, a current flows in the coil, with its polarity set to try to keep the magnetic flux constant. For example, if the north pole of the magnet moves toward the coil, the induced current will flow counter‑clockwise when viewed from the magnet, creating a north pole at the coil’s near side to repel the incoming magnet. The magnitude of the current depends on how fast the magnet moves and how many turns the coil has.

Detailed Explanation

When the magnet moves, the magnetic field through the coil changes. Other options are incorrect because Some think the current will fall because the magnet is moving away; Another idea is that nothing changes because the magnet is only moving, not touching.

Key Concepts

Faraday's Law of Electromagnetic Induction
Topic

Electric Field Induction Extension

Difficulty

easy level question

Cognitive Level

understand

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