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Biot-Savart law indicates that the movin...

Biot-Savart law indicates that the moving electrons (velocity v) produce a magnetic field `vecB` such that

A

B is perpendicular of v

B

B is parallel to v

C

it obeys inverse cube law.

D

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

Text Solution

Verified by Experts

The correct Answer is:
A
`ivec(dl)` is opposite to velocity of electron because `vecB||ivec(dl)xxvecr` is given.
According to right hand screw rule direction of `ivec(dl)xxvecr` is perpendicular to magnetic field.
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