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# The Study of Alternating Magnetic Field | Science Experiment

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## Introduction

In this experiment of the study of the alternating magnetic field, we will learn the reason behind the repelling of non-ferrous material by the magnet and the reason behind the slow down of magnetic slides under the non-ferrous material.

## Basic Building Concept

1. Due to the change in the magnetic field, a current is induced, which opposes the flux change. This is called the Lenz law, given by Heindrich Friedrich Emil Lenz.

2. When a metallic plate enters a magnetic field region, a current is induced in the metallic plate; this current is called eddy current.

3. The atomic structure of non-ferrous conductors makes it easy for the motion of electrons. Due to this rapid movement, electrons create an electromagnetic field outside the conductor.

4. In a loop, an electromotive force will induce due to the change in flux of the magnetic field when moving through a closed surface area. This law is called Faraday law.

Image Source: ResearchGate

## Aim

To study Alternating Magnetic Field to show the reasons behind:

a. Why are non-ferrous conductors repelled by the electromagnetic field,

b. Why do magnetic plates slide slowly under the non-ferrous conductors?

## Requirements

1. A wheel created by six alternating magnets

3. Piece of copper, aluminum, and wood

4. Copperplate

## Procedure

Step 1: Add the power drill to the wheel for constant speed spinning.

Step 2: Suspend the pieces of copper, aluminum, and wood next to the wheel. This setup will exhibit the law of Faraday.

Step 3: Now, carefully measure the repelled distance of all three materials from the wheel, one by one.

Step 4: At the end of the axle, place a copper plate to demonstrate Lenz’s law.

Step 5: Next to the spinning copper plate, there is a steel hinge, placing a magnet on it.

Step 6: Observe it carefully.

Step 7: Set all three materials, wood, copper, and aluminum at an inclination, so that magnetic could slide down easily.

Step 8: Measure the time taken by the magnet to slide down from each material.

## Observation

1. We have observed that the magnet slides down faster from the aluminium than to copper.

2. On sliding down from the copper, electrons start moving in swirls in copper, which produces an eddy current.

3. Around the copper, this eddy current will generate an electromagnetic field that will repel the magnetic field of magnets.

4. In this way, we have seen that the magnetic field repulses non-ferrous material.

5. The electrons of the positive side of the magnet spin in one direction while the electrons of the negative side of the magnet spin in a different direction.

6. This creates an electromagnetic force around the copper. And the changing magnetic field of the wheel will repel this electromagnetic force.

## Result

1. Alternating magnetic field repulses non-ferrous conductors.

2. Magneti slides slowly under the non-ferrous conductors.

## Precautions

1. Measure the distance carefully.

2. Measure the time carefully.

3. Do not touch the setup in the middle of the experiment.

## Conclusion

In this way, we have studied the alternating magnetic field and learned the reason behind the repelling of non-ferrous material by the magnet and also the reason behind the slow down of magnetic slides under the non-ferrous material with the help of Faraday’s law and Lenz’s law.

Q.1 What was the aim of our experiment?

ANS. To study Alternating Magnetic Field to show the reasons behind:

a. Why non-ferrous conductors repelled by the electromagnetic field,

b. Why do magnetic plates slide slowly under the non-ferrous conductors

Q.2 What do you know about Lenz’s law?

ANS. Due to the change in a magnetic field, a current is induced, which opposes the flux change. This is called the Lenz law.

Q.3 By whom Lenz law has been given?

ANS. Heindrich Friedrich Emil Lenz.

Q.4 What do you know about eddy current?

ANS. When a metallic plate enters a region of the magnetic field, a current is induced in the metallic plate; this current is known as eddy current.

Q.5 Who has given the faraday law?

ANS. In a loop, an electromotive force will induce due to the change in flux of the magnetic field when moving through a closed surface area. This law is knownn as Faraday law.

Q.7 What do you understand? By electromotive force?

ANS. It is a kind of electrical force that is produced by a non-electrical source.

Q.8 What do you understand about the flux of a magnetic field?

ANS. The line of the magnetic field makes an angle with the normal. This is called the flux of the magnetic field.

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