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The trajectory of a charged particle moving parallel to a uniform magnetic field is [[1]]line.

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Detailed Solution

The trajectory of a charged particle moving parallel to a uniform magnetic field is straight line.
According to Lorentz’s force,

F = qvBSinθ

Where

F

represents force on the particle having charge

q

units having velocity

v

in the magnetic field

B

and

θ

is the angle between the direction of magnetic field and the direction of motion of charge particles.
Since the charged particle moves along the direction parallel to the magnetic field. Therefore

θ = 180^{0}

.
Then the force acting on the particle is,

F = qvBSin 180^{0}

= 0

.
Then the particle continues moving along the trajectory i.e. straight line.

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