Two short bar mangets of length 1 cm eac...

Two short bar mangets of length 1 cm each have magnetic moments 1.20 and 1.00 `am^(2)` respectively they have a common magnetic value of the resultant horizontal magnetic induction at the mid point O of the line joining their centre is close to

`2.56 xx10^(-4) wb//m^(2)`

`3.50 xx10^(-4) -wb//m^(2)`

`5.80 xx10^(-4) wb//m^(2)`

`3.6 xx10^(-5) wb//m^(2)`

Verified by Experts

The correct Answer is:

`because` Magnetic field due to short dipole `B=(mu_(0)M)/(4pix^(3))`

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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

`sqrt(2)xx10^(-7)` tesla

`sqrt(5)xx10^(-7)` tesla

`sqrt(2)xx10^(-3)` tesla

`sqrt(5)xx10^(-3)` tesla

`(mu_(0))/(4pi)sqrt(2)(M)/(d^(3))`

`(mu_(0))/(4pi)sqrt(3)(m)/(d^(3))`

`(2mu_(0))/(pi)(m)/(d^(3))`

`(mu_(0))/(4pi)sqrt(5)(m)/(d^(3))`

`2.15 xx10^(-5) T`

`215xx10^(-5) T`

`2.15xx10^(-3) T`

`21.5 xx10^(-5) T`