PhysicsMagnetic Effects of Electric CurrentElectromagnetic Induction – Part 1

Electromagnetic Induction – Part 1

Table of Contents

  • Electromagnetic Induction

– Reason for Deflection in the Galvanometer in Faraday’s Experiment

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    • Summary
    • What’s Next?

    In the previous segment, we learnt about the electric motor. In this segment, let us understand electromagnetic induction.

    What is Electromagnetic induction?

    • A Galvanometer is used to detect the presence of current in the circuit.
    • It can detect small currents as well as give the direction of the currents.
    • In 1831, Michael Faraday connected a coil with a galvanometer. He moved a bar magnet towards the coil and away from it. He observed that when the magnet was taken towards the coil, the galvanometer deflected to one side and when the magnet was taken away from the coil, the galvanometer deflected to the other side. He also observed that when the magnet was stationary, there was no deflection in the galvanometer. He called this phenomenon Electromagnetic induction.
    • Electromagnetic induction is the phenomena in which electric current is produced in a circuit whenever there is a change in the magnetic field around a coil.

    For example, if a bar magnet is moved inwards or outwards of a coil, a current is induced in the coil.

    • Current is not induced in a circuit if there is no change in the magnetic lines of force.

    For example, if a stationary magnet is held around or inside a coil, no current will be induced in it.

    Why did the galvanometer show a deflection in Faraday’s experiment?

    • When Faraday took the magnet towards the coil, the magnetic lines of force entering the coil increased. That is, there was a change in the magnetic field. Hence, the galvanometer showed a deflection.
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