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Fleming's Left Hand Rule

Question

You are sitting in a room in which a strong magnetic field is directed from your left towards right. A beam of electrons is directed from front towards you. What would be the direction of magnetic force on this beam ?
downwards.
upwards.
towards right
towards left

A

towards left

B

upwards.

C

downwards.

D

towards right

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Solution

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The direction of the magnetic field is from left to right, the direction of the beam of electrons is from your front hence the direction of the current is from back to front. Now by applying Fleming left hand rule such that middle finger point from back to front and index finger point from left to right then thumb will point downwards hence the magnetic force on the beam of electron is downwards.

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