Two short magnets of magnetic moment `1000 Am^(2)` are placed as shown at the corners of a square of side `10 cm`. The net magnetic induction at P is

Options

A. `0.1 T`
B. `0.2T`
C. `0.3T`
D. `0.4T`

Answer

A

Explanation

Point P lies on equatorial line of magnet (1) and axil line of magnet (2) as shown
`B_(1)=mu_(0)/(4pi).M/d^(3)=10^(-7)xx1000/((0.1)^(3))=0.1T`
`B_(2)=mu_(0)/(4pi).(2M)/d^(3)=10^(-7)xx(2xx1000)/((0.1)^(3))=0.2T`
`:. B_("net")=B_(2)-B_(1)=0.1T`