An electron makes 3 × 10 5 revolutions per second in a circle of radius 0.5 angstrom. Find the magnetic field B at the centre of the circle.

Question

Philoid · Accepted Answer

no of revolutions = 3 × 10⁵

radius = 0.5 angstrom = 5×10⁻¹¹ m

Thus, the magnetic field at the centre due to the current in the loop is given by

We know that,

Here n=1,

I= =

and r= 5×10⁻¹¹ m

Hence,