Question

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= $3 \times 10^8\,ms^{-1}$ )

• A. $\frac{1}{\in_0\,10^{16}}$
• B. $\frac{10^{16}}{\in_0}$
• C. $\frac{\in_0}{10^{16}}$
• D. $10^{16}\,\in_0$

Answer 1

Answer: (A)

$\frac{1}{\in_0\,10^{16}}$

Answer 2

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