1.

Two small magnetseach of magnetic moment M_(0)is placed parallelto each other the magneticfield at point O is

Answer»

`zero `
`4xx10^(-4)`N
`2xx10^(-4)` N
none of these

Solution :Mag field at pointon EQUITORIAL line for a short dipole
`B=(mu_(0)M_(0))/(4pir^(3))`

`B_(1)=B_(2)=(mu_(0)M_(0))/(4pir^(3))`
`therefore B=B_(1)-B_(2)=0`


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