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  • Electromagnetic Induction.

  • 1st day, 2nd day.

  • Hello.

  • Mr. Hans Christian Oersted.

  • Battery.

  • Switch.

  • Magnetic compass needle.

  • Conductor.

  • Electric current.

  • Needle deflects.

  • This indicates presence of magnetic field.

  • Electric current.

  • Needle deflects.

  • This indicates presence of magnetic field.

  • This proves that electric current produces a magnetic field.

  • Electric current : Magnetic field.

  • Magnet : Electric current.

  • Is this possible?

  • Galvanometer.

  • Magnet.

  • Coil.

  • Needle is not deflecting. That means no current is being induced.

  • Motion of the magnet is causing the needle to deflect.

  • Now, let me keep the magnet fixed and move the coil.

  • I can still see deflection.

  • Current is induced in the coil due to relative motion between the magnet and coil.

  • When I moved the magnet away, needle deflected in the opposite direction.

  • That means the current is now being induced in the opposite direction.

  • Now, let me try to reverse the poles of the magnet.

  • The deflection reversed when the pole was reversed.

  • North pole going inside the coil, deflection towards right.

  • North pole coming out of the coil, deflection towards left.

  • South pole going inside the coil, deflection towards left.

  • South pole coming out of the coil, deflection towards right.

  • Let me try to move the magnet faster.

  • Faster motion of magnet.

  • Faster motion : Faster needle deflection : Rate at which current is induced is more.

  • Conclusions of experiment.

  • Relative motion: Current is induced due to relative motion between the magnet and coil.

  • Pole reversal: Deflection reverses when the poles of the magnet are reversed. This direction of deflection shows the direction of flow of current.

  • Speed: Faster motion of the magnet or coil causes a faster deflection, that is, rate at which the current is induced is more.

  • Faraday's law of electromagnetic induction.

  • This production of electric current across a conductor when exposed to a changing magnetic field is known as electromagnetic induction.

  • The End.

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Electromagnetic Induction.

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B2 中高級 美國腔

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    AumSum 發佈於 2021 年 01 月 14 日
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