Two short bar magnets of length 1cm have magnetic moments `1.20 " Am"^(2)` and `1.00 " Am"^(2)` , respectively .
They are kept on a horizontal table parallel to each other with their North poles pointing towards the south . They have a common magnetic equator and are separated by a distance of `20.0` cm. The value of the resultant horizontal magnetic induction at the midpoint O of the line joining their centers is ( Horizontal components of Earth's magnetic induction is `3.6 xx 10^(-5) Wb m^(-2)`).

Options

A. `3.60 xx 10^(-5)" Wb " m^(-2)`
B. `3.5 xx 10^(-5) " Wb " m^(-2)`
C. `2.56 xx 10^(-4) " Wb " m^(-2)`
D. `2.2 xx 10^(-4) " Wb " m^(-2)`

Answer

(c ) `2.56 xx 10^(-4) " Wb " m^(-2)`