First slide
Magnetic field due to a moving charge
Question

In a hydrogen atom, an electron moves in a circular orbit of radius 5.2  ×1011m and produces a magnetic induction of 12.56 T at its nucleus. The current produced by the motion of the electron will be Given  μ0=4π  ×  107Wb/Am

Moderate
Solution

B  =  μ04π.2πir    12.56=107  ×2π×i5.2×1011   i=1.04×103A

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