Electromagnetic Induction

APPARATUS

• Ballistic galvanometer
• Horseshoe magnet
• Bar magnets
• Leads
• Wired metal rod
• Induction coils
• 60 microamp galvanometer

METHOD

1. The coil was connected to a Microammeter. The N pole of the magnet was inserted into the solenoid and a description was recorded.
2. The magnet was held stationary in the solenoid. A description of the results was recorded.
3. The N pole was withdrawn from the solenoid and a description was recorded.
4. Steps 1-3 were repeated with different speeds.
5. Steps 1-4 were repeated with a magnet of a different strength.
6. All observations were recorded.

RESULTS

CONCLUSION

The experiment has demonstrated that when a coil experiences a change in magnetic flux a current is induced. The differences in the magnitude of the currents induced were as a direct result of Faraday’s law which states that “the induced EMF in a circuit is equal to the rate at which the magnetic flux through the circuit is changing with time”. From the analysis of the formula and the law it can be seen that the induced current depends on three things: the number of coils, the relative motion and the magnetic field strength. Thus, the current differences seen in the experiment reflect this law.