Q. Biot-Savart law indicates that the moving electrons (velocity ) produce a magnetic field such that:

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A

B

C

it obeys inverse cube law.

D

it is along the line joining the electron and point of observation.

Solution:

According to Biot-Savart law

Where, Magnetic field Produced
Velocity of charged particle
Position vector of point with respect to charge
Magnetic permeability of free space
It is a cross product and
Is perpendicular to .

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