2,486
edits
Changes
Jump to navigation
Jump to search
Line 621:
Line 621: − +
Activities/Turtle Art/Using Turtle Art Sensors (view source)
Revision as of 02:43, 4 February 2011
, 02:43, 4 February 2011→Ampere's Law
*I in amps
*I in amps
In the special case of a wire in free space, the integral is easy to evaluate. At a radius r, the field is uniform over a circular path round the wire , the path length is 2πr. So for the magnetic field B at a radius r from a wire in free space, B2πr=u0I.
In the special case of a wire in free space, the integral is easy to evaluate. At a radius r, the field is uniform over a circular path round the wire , the path length is 2πr. So for the magnetic field B at a radius r from a wire in free space, [[File:B2Pir-equals-uoI.jpg]]