Q.

Biot-Sawart law indicates that the moving electrons (velocity v) produce a magnetic field B such that 

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a

B  v

b

B  v

c

It obeys inverse cube law. 

d

It is along the line joining the electron and point of observation

answer is A.

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Detailed Solution

According to Biot-Savart law, dB=μ04πidl×rr3

dB=μ04πdqdtdl×rr3

dB=μ04πedldt×rr3

dB=μ04πdqv×rr3

It indicates that the moving electrons (velocity v) produce a magnetic field B such that B  v.

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