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. `ointB.dl=mu_(0)I`
B. the value of `ointB.dl=+-2mu_(0) I` is independent of sense of C.
C. there mat be a point on C where, B and dI are perpendicular
D. B vanishes everywhere on C.
