Question

In toroid magnetic field on axis will be radius = 0.5 cm, current = 1.5A, turns = 250, permeability = 700.

• A. 7.5 Tesla
• B. 10.5 Tesla
• C. 4.5 Tesla
• D. 15.5 Tesla

Answer 1

Answer: (B)

10.5 Tesla

Answer 2

$B=\mu o\mu r\left[\frac{N}{2\pi r}\right]I$ $B=700\times4\pi\times10^{-7}\left[\frac{250\times100}{2\times\pi\times0.5}\right]\times1.5$ $=\frac{1400\times10^{-7}\times10^{3}\times1.5}{0.5}$ $= 75 ??1400 ??10^{-4}$ Tesla $= 75 ??14 ??10^{-2}$ Tesla $= 1050 ??10^{-2}$ Tesla = 10.5 Tesla