The magnetic field at the centre of the coil in the figure shown below is ( the wires crossing at p are insulated from each other )

Options

A. `(mu_(0))/(4pi)(2I)/(r)(1+pi)`
B. `(mu_(0))/(4pi)(2I)/(r)(pi-1)`
C. `(mu_(0))/(4pi)(2I)/(r)(pi^(2)+1)`
D. `(mu_(0))/(4pi)(2pi I)/(r)`

Answer

1

Explanation

`B=B_(1)+B_(2),B_(1)=(mu_(0)ni)/(2r),B_(2)=(mu_(0)i)/(2pir)`