Problem statement: Calculate the magnetic field at point P located on the axis at a distance of 10 cm from the center of a circular wire of radius 5 cm carrying a current of 5 A.
radius of circular wire: a = 5 cm = 0.05 m
current I = 5 A
On the axis, the distance between the center of the circular wire and the point P: x = 10 cm = 0.1 m
Number of turns N = 1 (as it is not mentioned in the question, we are assuming it to be 1)
Magnetic field B = ?
B = (μ0 N I a2) / [2 (a2 + x2)3/2]
we know, μ0 = 4π x 10-7
Putting all values:
=> Magnetic field B = [ 4π x 10-7 x 1 x 5 x 0.052] / [ 2 (0.052 + 0.12)3/2]
B= 57.2 x 10-7 T