A wire bent in the shape of a regular n-polygonal loop carries a steady current I. Let `l` be the perpendicular distance of a given segment and R be the distance of vertex both from the centre of the loop. The magnitude of the magnetic field at the centre of the loop is given by -

Options

A. `(n mu_(0)I)/(2pi l)sin(pi//n)`
B. `(n mu_(0)I)/(2pi R)sin(pi//n)`
C. `(n mu_(0)I)/(2pi l)cos(pi//n)`
D. `(n mu_(0)I)/(2pi R)cos(pi//n)`

Answer

A