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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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# Electromagnetic Induction | #aumsum

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AumSum posted on 2019/04/15
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