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Magnetic Field
due to
a Current-Carrying Wire
Physics
Mr. Berman
A Current-Carrying Wire Causes
a Magnetic Field Around it.
Hans Christian Oersted, 1820
Right Hand Curl Rule
Magnetic Fields of Long Current-Carrying
Wires
B = mo I
2p r
I = current through the wire (Amps)
r = distance from the wire (m)
mo = permeability of free space
= 4p x 10-7 T m / A
B = magnetic field strength (Tesla)
I
Example 1
• What is the magnitude of the magnetic
field created by a 0.25A current at a
distance of 50cm from the wire?
• Answer: 1x10-7 Tesla
Note
• The overall shape of the magnetic field of
the circular loop is similar to the magnetic
field of a bar magnet.
Note
• If the wires have currents in opposite
directions, the wires repel each other.

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