the formula for magnetic field due to a magnet and force of attraction or repulsion is same [(u0/4pie) (m1m2/l)]? the difference lies with the length as in for magnetic dipole l=2l and for magnetic field l=l?

Dear student,
Your question is not clear.Moreover its not clear what is the query. Kindly be more specific.
regards

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I think you should check your question again 
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