Magnetic field around a wire
Change the current and the distance from the wire to see the magnetic field strength in teslas.
Works in metric or imperial units.
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Questions students ask
Which way does the field go?
Use the right-hand grip rule: thumb along the current, fingers curl in the direction of the field lines, in circles around the wire.
What formula does it use?
B = μ₀I/(2πr), μ₀ = 4π × 10⁻⁷ T m/A.
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