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AP EAMCET Engineering 2012 Solved Paper

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Question : 13

Total: 160

A long curved conductor carries a current I (I is a vector). A small current element of length dl, on the wire induces a magnetic field at a point, away from the current element. If the position vector between the current element and the point is r, making an angle with current element then, the induced magnetic field density; dB (vector) at the point is (µ0= permeability of free space )

µ0 Id l×r
4πr
(perpendicular to the current element dl )
µ0I×r×dl
4πr2
(perpendicular to the current element dl )
µ0I×dl
r
(perpendicular to the plane containing the current element and position vector r )
µ0I×dl
4πr2
(perpendicular to the plane containing current element and position vector r )

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