Question

The average radius of a torpid made out of a nonmagnetic material is 0.1 m and it has 500 turns. If it carries 0.5 ampere current, then the intensity of magnetic field along its circular axis in Tesla will be

• A. $2.5\times {10}^{-4}$
• B. $5\times {10}^{-3}$
• C. $5\times {10}^{-2}$
• D. $2\times {10}^{-3}$

Answer 1

The correct option is A $2.5\times {10}^{-4}$

For Torpid

N $=500$ turn

p $=0.5A$

r = $0.1m$

$B={\mu }_0\frac{NI}{2\pi r}$

$=\frac{{\mu }^2\pi \times {10}^{-7}\times 500\times 0.5}{2\times \pi \times 0.1}=\frac{500\times 5}{{10}^7}$

$=2.5\times {10}^{-4}$ Tesla