NDA 2022 Physics question

The magnetic field produced by a current-carrying straight wire at a point outside the wire depends

(A)inversely on the distance from itCorrect
(B)directly on the distance from it
(C)inversely at short distances and directly at large distances from it
(D)directly on the distance (at short distances) and inversely on the distance (at long distances) from it

Answer: (A)

Solution

For a long straight wire carrying current , the field at a distance outside the wire is . It is inversely

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Question ID VK-032058