Which of the following choices of path allow you to use ampère's law to find vector b(r)?
a) the path must pass through the point r .
b) the path must have enough symmetry so that b(r)*dl is constant along large parts of it.
c) the path must be a circle.

my answer would be (b The path must have enough symmetry so that B(r)*dl is constant along large parts of it.

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i just did this and got a 100.

f=ma newton's second law 7x8=56n