Two identicla short bar magnets each having magnetic moment of `10 am^(2)` are arranged such that their axial lines are perpendicular to ech other and their centres 0.2 m the resultant magnetic inducito at a point midway betweeen them is

Options

A. `sqrt(2)xx10^(-7)` tesla
B. `sqrt(5)xx10^(-7)` tesla
C. `sqrt(2)xx10^(-3)` tesla
D. `sqrt(5)xx10^(-3)` tesla

Answer

D

Explanation

`B_(net)=sqrt(B_(a)^(2)+B_(e )^(2))`
`=sqrt(5).(mu_(0))/(4pi).(M)/(d^(3))=sqrt(5)xx10^(-7)xx(10)/(0.1)^(3)=sqrt(5)xx10^(-3)` tesla