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JAMB Physics 2016 Paper

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Question : 2

Total: 48

A charged particle is moving in a uniform magnetic field. if the direction of motion of the charged particle is parallel to the magnetic field, the path of the charge will

Be a straight line
Curve inwards
Be a parabola
Curve outwards

Solution:

Concept:

The magnetic force on a charge is given by

\mathbf{F} = q(\mathbf{v} \times \mathbf{B})

.

Explanation:

When the velocity

\mathbf{v}

is parallel to the magnetic field

\mathbf{B}

, the angle between them is

0^\circ

or

180^\circ

.

So

|\mathbf{F}| = qvB\sin\theta = 0

.

Since no magnetic force acts on the particle, its velocity remains constant and the path is a straight line.

Answer:

A. Be a straight line

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