Objective

The objective of this experiment is to demonstrate the principles of electromagnetic induction using an air core inductor and to measure the induced voltage when the magnetic field changes.

Components Required

• 1 x Air Core Inductor (e.g., 100 turns of enameled copper wire wound around a non-magnetic core)
• 1 x DC Power Supply (e.g., 5V)
• 1 x Resistor (1kΩ)
• 1 x Multimeter (for measuring voltage)
• 1 x Switch
• Connecting Wires
• Breadboard (optional)

Theory

Electromagnetic induction occurs when a changing magnetic field induces an electromotive force (EMF) in a conductor. In this experiment, we will observe how switching the current in a coil (inductor) creates a change in the magnetic field and induces a voltage in the same or nearby circuits.

Circuit Diagram

Experimental Setup

1. Construct a circuit with the air core inductor, switch, resistor, and multimeter.

2. The inductor should be connected in series with the switch and the resistor, allowing current to flow through it when the switch is closed.

Procedure

1. Set up the circuit according to the circuit diagram provided.
2. Ensure all connections are secure and that the multimeter is set to measure voltage.
3. Close the switch to allow current to flow through the inductor.
4. Observe the multimeter reading; it should indicate a change in voltage as the inductor builds its magnetic field.
5. Quickly open the switch to interrupt the current and observe the voltage reading on the multimeter again.
6. Record the induced voltage reading on the multimeter.
7. Repeat the experiment several times, noting any variations in the induced voltage.

Results and Observations

Document the voltage readings obtained during the experiment. Note the differences in voltage induced when the switch is opened and closed, and any variations observed during multiple trials.

Conclusion

This experiment demonstrates the principles of electromagnetic induction using an air core inductor. The induced voltage observed upon changing the current flow through the inductor illustrates the fundamental principles of electromagnetic theory, highlighting the relationship between electricity and magnetism.