First slide

Force on a charged particle moving in a magnetic field

Question

A charged particle moves in a uniform magnetic field. The velocity of the particle at some instant makes an acute angle with the magnetic field. The path of the particle will be

Easy

A

A straight line
B

A circle
C

A helix with uniform pitch
D

A helix with non-uniform pitch

Solution

When particle enters a uniform magnetic field at an angle other than 0°, 90° or 180°, path followed is helix.

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