pls explain (iii)

Dear student,
(iii)
From BIOT-SAVART LAW magnetic field due to source idl is given by
dB=μ04πidl×rr3
which linearly dependent on source of magnetic field idl

​Electric field due to a point charge is given by
E=14πε0Qr2
which linearly depend on the source of filed Q

Regards
 

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