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  4. Magnetic field induction at the center of a circular coil of radius 5cm and carrying a current 0.9 A is ( in S.I. units) (∈0 = absolute permittivity of air in S.l. units: velocity of light= 3 × 108 ms-1 )

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Q. Magnetic field induction at the center of a circular coil of radius 5cm and carrying a current 0.9 A is ( in S.I. units) ($\in_0$ = absolute permittivity of air in S.l. units: velocity of light= $3 \times 10^8\,ms^{-1}$ )

Moving Charges and Magnetism

Solution:

$B=0$
$\frac{\mu_0\,i_1}{2 \pi\,y}=\frac{\mu_0\,i\,\theta}{4\pi\,x}$ c$=\frac{1}{\sqrt{\mu_0E_0}}$