Find the magnetic field at the point O center of the circle with R=20 cm if the current is I=100A ?

1 Answer
Apr 19, 2018

The magnetic field is #=3.14*10^-4T#

Explanation:

The magnetic field at the center of a circle(wire) carrying a current #I# is

#B=(mu_0I)/(2r)#

The constant #mu_0# is #"the permeability of free space"#

#mu_0=4pi*10^-7TmA^-1#

#r=0.2m#

#I=100A#

#B=(4pi*10^-7*100)/(2*0.2)T#

#=31.410^-5T#