# How Does a Magnet Affect Compass Direction in a Dual Coil Setup?

• sparkle123
Your Name]In summary, the north pole of a permanent magnet was held over a coil of wire with a hollow core, and a second coil with a hollow core was connected to the first coil. A magnetic compass needle was placed into the second coil and would rotate towards the south when the north pole of the magnet was plunged into the first coil. This is due to the induced current in the wire creating a magnetic field with a north pole facing towards the incoming magnet, in accordance with Lenz's Law.
sparkle123
The north pole of a permanent magnet was held over a coil of wire with a hollow core, as shown. A second coil with a hollow core was connected to the first coil as shown. A magnetic compass needle was placed into the second coil, free to rotate in a vertical circle as shown. If the north pole of the magnet was plunged into the first coil, towards what point will the compass needle rotate?

The answer is C, but I thought it would be D because by Lenz's Law the north pole would be on the left.

Hello,

I would like to clarify the answer to this question. The correct answer is indeed C, as the compass needle would rotate towards the south. This is because when the north pole of a magnet is plunged into a coil of wire, it induces a current in the wire that creates a magnetic field with a north pole facing towards the incoming magnet. This north pole then repels the north pole of the compass needle, causing it to rotate towards the south.

The concept of Lenz's Law, which states that an induced current will create a magnetic field that opposes the change in magnetic flux, is still applicable in this scenario. However, in this case, the induced magnetic field is created by the current in the wire, not by the magnet itself.

I hope this clarifies any confusion. Thank you for your interest in this topic.

## 1. What is the concept behind a magnet being plunged into a coil?

The concept is based on Faraday's law of electromagnetic induction, which states that a changing magnetic field will induce an electric current in a nearby conductor.

## 2. How does the strength of the magnet affect the induced current?

The strength of the magnet has a direct impact on the induced current. A stronger magnet will produce a stronger magnetic field, causing a larger change in the magnetic flux and therefore a larger induced current.

## 3. What factors influence the strength of the induced current?

The strength of the magnet, the speed at which it is plunged into the coil, the number of turns in the coil, and the material of the coil are all factors that can influence the strength of the induced current.

## 4. Can a magnet be plunged into any type of coil?

Yes, as long as the coil is made of a conductive material such as copper or aluminum, a magnet can be plunged into it to induce a current.

## 5. What are some real-world applications of a magnet being plunged into a coil?

This concept is used in generators, transformers, and other electrical devices to convert mechanical energy into electrical energy. It is also used in metal detectors, MRI machines, and other technology that utilizes electromagnetic induction.

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