Magnetic fields by a current question?

Question

The magnetic field of a proton is approximately like that of a circular cureent loop 0.650 * 10^-15 m in radius carrying 1.05*10^4 A. What is the field at the center of such a loop?

Answer 1

The Biot-Savart Law is used to calculate magnetic fields for a given current distribution.

In the case of a current flowing in a loop the magnetic field B at the center of the loop is

B = mu0*i/2/R

plugging in the numbers:

B = 1.01 X 10^13 webers/m^2 (or tesla)

A huge magnetic field