→δB=μ04πIdlsin(θ)r2^r, where θ is the angle between the line element →dl and the radial unit vector ^r.
Now we know: ^r=→rr, using this and the cross product of two vectors we get; →δB=μ04πI(→dl×→r)r3
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[CBSE PMT 1996; MP PET 2002; MP PMT 2000]
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