(a) Magnetic field strength at the loop centre can be found as follows:
B=2Rμ0I,B=2⋅1.0⋅10−2 m4π⋅10−7 A2N⋅650⋅10−3 A=40.8⋅10−6 T=40.8 μT.(b) Magnetic field strength on the loop axis, 20 cm from the centre can be found as follows:
B=21(x2+R2)μ0IR2,B=21⋅((20⋅10−2 m)2+(1.0⋅10−2 m)2)3/24π⋅10−7 A2N⋅650⋅10−3 A⋅(1.0⋅10−2 m)2,B=5.08⋅10−9 T=5.08 nT.
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