For amperes law it is stated that: ∫Bdl=μIenc My confusion is that B is that for example here now on earth if I have a compass. It interacts with a the magnetic field of the earth and points north. There is no I-enclosed yet there is still a magnetic field? Also another Amperes Law question involving a toroid: Outside of a toroid it is stated that the magnetic field is 0 because Ienc is 0. Can you not enclose current if your amperian path is larger than the toroid itself?