Question

How will the fine pencil particles of electron streaming in west to east direction be affected by a magnetic field directed vertically upwards?Give the rules used here.Give the priciple of electric motor.

Answer 1

Here the direction of positively charged alpha particle is towards west this implies the ... to Fleming's left hand rule, the direction of magnetic field will be upwards.

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Answer 2

The electron will experience a force that acts into the plane.
The direction of current is opposite to the direction of electron flow
Use this and apply in Fleming's Left Hand Rule
You'll get it
The principle of electric motor is Electromagnetism.