A circular loop and a long, straight wire carry currents. The current in the wir

Question

A circular loop and a long, straight wire carry currents. The current in the wire is

toward the right in the sketch. The current in the loop is

and is counterclockwise. The radius of the loop is

and the point on the loop closest to the long, straight wire is

from the wire

What are the magnitude and direction of the resultant magnetic field at the center of the loop (point P)?

A circular loop and a long, straight wire carry currents. The current in the wire is I1 = 12.0 A, toward the right in the sketch. The current in the loop is I2 = 4.20 A and is counterclockwise. The radius of the loop is R = 0.190 m and the point on the loop closest to the long, straight wire is d = 0.0800 m from the wire. What are the magnitude and direction of the resultant magnetic field at the center of the loop (point P)?

Explanation / Answer

u*I1/(2*pi*(R+d))-u*I2/(2*R)=4*pi*10^-7*(12/(2*pi*(0.19+0.08))-4.2/(2*0.19))=5*10^-6 T

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