A point charge is moving in a circle with constant speed. Consider ...

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A point charge is moving in a circle with constant speed. Consider the magnetic field produced by the charge at a fixed point \( \mathrm{P} \) (not centre of the circle) on the axis of the circle.
(A) it is constant in magnitude only
(B) it is constant in direction only
(C) it is constant in direction and magnitude both (D) it is not constant in magnitude and direction both.
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