A circular metal loop of radius 10 cm and three long straight wires carry currents of

I _ { 1 } = 60 \mathrm {~A} ,

\mathrm { I } _ { 2 } = 20 \mathrm {~A} ,

I _ { 3 } = 70 \mathrm {~A} ,

and

I _ { 4 } = 30 \mathrm {~A} ,

as shown in the figure. Each of the straight wires is 20 cm from the center of the loop. The axes are shown in the figure, with the +z-axis coming out of the paper. What is the z component of the resultant magnetic field at the center of the loop? (?₀ = 4? × 10^-7 T ? m/A) $A circular metal loop of radius 10 cm and three long straight wires carry currents of I _ { 1 } = 60 \mathrm {~A} , \mathrm { I } _ { 2 } = 20 \mathrm {~A} , I _ { 3 } = 70 \mathrm {~A} , and I _ { 4 } = 30 \mathrm {~A} , as shown in the figure. Each of the straight wires is 20 cm from the center of the loop. The axes are shown in the figure, with the +z-axis coming out of the paper. What is the z component of the resultant magnetic field at the center of the loop? (?<sub>0</sub> = 4? × 10<sup>-7</sup> T ? m/A) A)-360 ?T B)+360 ?T C)-40 ?T D)+40 ?T E)-170 ?T$
A)-360 ?T
B)+360 ?T
C)-40 ?T
D)+40 ?T
E)-170 ?T

A Ring with a Clockwise Current (As Viewed from Above

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