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Question

# A point charge is moving in a circle with constant speed. Consider the magnetic field produced by the charge at a fixed point P (not at the center of circle) on the axis of the circle.

A
it is constant in magnitude only
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B
it is constant in direction only
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C
it is constant both in direction and magnitude both.
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D
it is constant neither in magnitude nor in direction both.
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Solution

## The correct option is D it is constant in magnitude onlyThe point charge moves in circle as shown in figure. The magnetic field vectors at a point P,→BA and →BC at the instant the point charge is at A and C respectively, as shown in figure.

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