1.

Tow identical short barmagnets each having magnetic moment m are placed a distance of 2dapart with axes perpendicualr to each other a horizontal plane the magnetic inlduciton at point midway between them is

Answer»

`(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))`

Solution :At POINTP net MAGNETIC field`B_("net")=sqrt(B_(1)^(2)+B_(2)^(2))`
`rarr B_(net)=(mu_(0))/(4pi).(sqrt(5)M)/(d^(3))`


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