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Two identical current carrying coaxial loops, carry current I in an opposite sense. A simple amperian loop passes through both of them once. Calling the loop as C,
(a) \oint Bdl =\mp\mu _{0}I
(b) the value of  \oint Bdl =2\mu _{0}I is independent of sense of C
(c) there may be a point on C where, B and dl are perpendicular
(d) B vanishes everywhere on C

Answers (1)

The correct answers are the options (b, c).

 In case of the given current distribution, Ampere’s law states another method to calculate the magnetic field.

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