An electron moving in a circular orbit of radius `r` makes `n` rotation per secound. The magnetic field produced at the centre has magnitude

Options

A. Zero
B. `(mu_(0)n^(2)e)/r`
C. `(mu_(0)ne)/(2r)`
D. `(mu_(0)ne)/(2 pi r)`.

Answer

c

Explanation

Frequency of revolution = n
Current generated due to revolution of electron, `I =ne `
Magnetic field at the centre of loop will be
`B = (mu_(0)I)/(2r) = (mu_(0)ne)/(2r)`