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Questions  

A point charge is moving in clockwise direction in a circle with constant spee(d) 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

detailed solution

Correct option is A

he magnetic field at a point on the axis due to charge moving along a circular path is given by μ04πqv→×r→r3' It can be seen that the magnitude of the magnetic field at a point on the axis remains constant. But direction of the field keeps on changing.

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Two infinitely current carrying insulated wires AB and CD are carrying same current  I. The wires cross each other at right angles as shown in figure. Three identical conductors P1Q1 , P2Q2 and P3Q3, carrying same current are placed a shown in figure and the forces acting on them are F1 , F2 and F3 respectively. Then select the correct option.


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