A)
B)
C)
D)
Correct Answer: A
Solution :
(a) Magnetic field due to a long straight wire of radius a carrying current l at a point distant r from the centre of the wire is given as follows: \[B=\frac{{{\mu }_{0}}lr}{2\pi {{a}^{2}}}\] for \[r<a\] \[B=\frac{{{\mu }_{0}}l}{2\pi a}\] for \[r=a\] \[B=\frac{{{\mu }_{0}}l}{2\pi r}\] for \[r>a\] The variation of magnetic field B with distance r from the centre of wire is shown in the figure.You need to login to perform this action.
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