Two concentric circular coils of 10 turns each are situated in the same plane. Their radii are 20 cm and 40 cm and they carry 0.2 A and 0.3 A currents respectively in opposite directions. The magnetic field at the center is

$\frac{35}{4}μ_0T$ $\frac{1}{80}μ_0T$ $\frac{7}{80}μ_0T$ $\frac{5}{4}μ_0T$

$\frac{5}{4}μ_0T$

The correct answer is Option (4) → $\frac{5}{4}μ_0T$