Two small magnets are placed horizontally,perpendicular to the magnetic meridian.Their north poles are at 30cm East and 20cm west from a compass needle.if the compass needle remains undeflected compare the magnetic moments of the magnets

Dear Student ,
here in this question the needle remains undeflected that means that point the magnetic field is zero .
Now when , the north poles are 30 cm east and 20 cm west from a compass needle then ,
B1=μ04πm1303 and B2=μ04πm2203Now as the B1=B2=0 then ,μ04πm1303=μ04πm2203m1m2=3323=278m1:m2=27:8
Regards

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