Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose 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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