Ampere's law states that B = μ0I / 2πr

Question

Options:

A . people want to see wires move

B . it allows people to calculate a magnetic field as long as they know how much current there is and the radius of a conductor

C . it allows people to calculate a magnetic field as long as they know how much current there is and the length of a wire

D . it allows people to calculate the amount of current passing through as long as they know the magnetic field strength and the radius of a conductor

Answer: Option B

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