The magnetic induction at a point 1000 mm from the centre of the dipole alor is equal in magnitude to the earth's horizontal component of magnetic field. The angle of dip `delta` is such that `cos delta= sin delta and B_(v)= 5 xx 10^(-4)T.` The magnetic dipole moment is

Options

A. `4 xx 10^(3) A m^(2)`
B. `5 xx 10^(3) A m^(2)`
C. `5 xx 10^(-4) A m^(2)`
D. `4 xx 10^(4)A m^(2)`

Answer

B