Question

A circular coil of wire has 100 turns. The radius of the coil is 50 cm. It is desired to have a magnetic induction of 80 μT at the centre of the coil. What should be the current through the coil ?

Answer 1

Data: N = 100, 

R = 50 cm = 0.5 m,

B = 80 μT = 8 × 10^-5 T, 

μ₀ /4π = 10^-7 T∙m/A

B = \(\cfrac{\mu_0NI}{2R}\)

\(\therefore\) The current, 

I = \(\cfrac{2BR}{\mu_0N}\)