NIOS Class 10 Science Activity 17.4 Magnetic Effect of Electric Current

This activity demonstrates how electric current is generated by changing a magnetic field and explains the principle of electromagnetic induction.

Magnetic Effect of Electric Current Activity Solution

This activity is based on the NIOS Class 10 science and technology (212) Chapter 17- Magnetic Effect of Electric Current, Module 4- Energy

Generation of Electricity by a Magnetic Field

Aim

To show that electricity can be generated by moving a magnet near a coil

Materials Required

    1. Strong bar magnet

    2. Insulated copper wire

    3. Plastic or bamboo pipe

    4. Disposable syringe

    5. LED (Light-emitting diode)

    6. Plastic bottle cap

    7. Connecting wires

Procedure

We wind several turns of thin, insulated copper wire around the middle portion of a pipe of cardboard, bamboo, or plastic to make a coil. We connect the two free ends of the wire to a galvanometer to detect current. Now we hold a strong bar magnet parallel to the coil and move it toward and away from the coil, and observe the galvanometer.

Now we take a disposable syringe and wind a coil of thin, insulated copper wire around it. We connect the free ends of the wire to an LED fixed on a plastic bottle cap. Then we insert a small cylindrical magnet inside the syringe barrel and move it back and forth, and observe the LED.

Observation

When the magnet is moved toward and away from the coil, the galvanometer shows deflection.

The direction of deflection reverses when the direction of magnet movement changes.

In the syringe experiment, the LED glows when the magnet moves.

Explanation

When a magnet moves near a coil, the magnetic field around the coil changes, and an electric current is induced in the coil. This is known as Faraday’s law of electromagnetic induction.

So, a change in the magnetic field around the coil generates an electric current. This principle is the basic concept of electric generators.

Conclusion

We can conclude that a change in the magnetic field around a coil induces an electric current in the coil. This phenomenon is called electromagnetic induction.

Frequently Asked Questions

    1.  What happens when the magnet is kept stationary near the coil?

Answer – No, electric current is produced in the coil because the magnetic field around the coil is not changing.

    2. Why does the galvanometer needle shoe deflection the magnet moves?

Answer - As we know a galvanometer is used to detect current. Electric current is induced in the coil when magnetic field changes so the needle of galvanometer deflects.

    3. What principle is demonstrated in this activity?

Answer – This activity demonstrates Faraday’s law of electromagnetic induction.

    4. What device works on the principle of electromagnetic induction?

Answer – Electric generator or dynamo

Related Topics 

NIOS Class 10 Science and Technology Chapter 17 Activities Solutions

S.N.	Topics
1	Activity 17.1 Solutions
2	Activity 17.2 Solutions
3	Activity 17.3 Solutions
4	Activity 17.4 Solutions