A flat circular loop of radius $0\mathrm{.}10$ m is rotating in a uniform magnetic field of $0\mathrm{.}20$ T$.$ When the plane of the loop and the magnetic field vector are parallel, the

magnetic flux through the loop is

a$)5\mathrm{.}5$ x $10-$ power $3$ T m power $2$

b$)0$T$.$ M power $2$

c$)6\mathrm{.}3$ x $10-$ power $3$ T$.$ m power $2$

d$)3\mathrm{.}1$ X $10-$ power $-3$ T m power $2$