Two short magnets of length 1 cm each have magnetic moments `1.20A.m^(2)` and 1.00`A.m^(2)` respectively. They are placed on a horizontal table parallel to each other with their N poles pointing towards the south. They have a common magnetic equator and are seperated by a distance 20.0 cm. The value of the horizontal magnetic induction at the midpoint O of the line joining their centres is close to (Horizontal component of earth's magnetic induction is `3.6xx10^(-5)T`

Options

A. `3.6 xx 10^(-5)T`
B. `2.56 xx 10^(-4)T`
C. `3.50 xx 10^(-4)T`
D. `5.80xx10^(-4)T`

Answer

B

Explanation

`B_("net")=B_(1)+B_(2)+B_(H), B_("net")=(mu_(0))/(4pi) (M_(1)+M_(2))`