Question

Two identical current carrying coaxial loops, carry current I in opposite sense. A simple amperian loop passes through both of them once. Calling the loop as C, then which statement is correct?

Options

• `oint vec"B" * vec"d"l = +- 2mu_0 "I"`

• the value of `oint_"c" vec"B" * vec"d"l` is independent of sense of C.

• there may be a point on C where B and dl are
  parallel.

• none of these

Answer 1

the value of `oint_"c" vec"B" * vec"d"l` is independent of sense of C.