Two concentric coils of 20 turns each are situated in the same plane. – McqOptions

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1.	Two concentric coils of 20 turns each are situated in the same plane. Their radii are 60 cm and 80 cm and they carry currents 0.4 A and 0.5 A respectively in opposite directions. Calculate the magnetic field at the center.
A.	( frac {5 mu_0}{4} )
B.	( frac {5 mu_0}{6} )
C.	( frac {5 mu_0}{8} )
D.	( frac {5 mu_0}{10} )
Answer» C. ( frac {5 mu_0}{8} )

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