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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