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A point charge is moving in clockwise di...

A point charge is moving in clockwise direction in a circle with constant speed. Consider the magnetic field produced by the charge at a fiexed point P (not at the centre of circle ) on the axis of the circle. Then,

A

it is constant in magnitude only

B

it is constant in direction only

C

it is constant both in direction and magnitude

D

It is constant neither in magnitude nor in direction

Text Solution

Verified by Experts

The correct Answer is:
A
(a) The point charge moves in circle as shown in Fig.
The magnetic field vectors at a point P on the axis of circle
are `vecB_A and vecB_C` at the instant the point charge is at A and C
respectively, as shown in Fig.

Hence, as the particle rotates in circle, only magnitude of mag-
netic field remains constant at P but its direction changes.
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Knowledge Check

  • A point charge is moving in clockwise direction 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. Then,

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

  • A particle is moving in a circle with a constant speed. Its moving is

    A
    Periodic
    B
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    C
    Simple harmonic
    D
    both 'a' and 'b'

  • If a body moves with a constant speed in a circle

    A
    no work is done on it
    B
    no force acts on it
    C
    no acceleration is produced in it
    D
    its velocity remains constant

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