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DaleSpam
DaleSpam is offline
#31
Feb15-12, 08:19 AM
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P: 16,466
In case I was misunderstanding universal's previous question, let me clarify the situation:

Frame 1 (lab frame):
Wire is neutral and carries a current. Test charge is moving. Electrostatic force on test charge is 0 because wire is neutral. Magnetic force on test charge is non-zero since charge is moving.

Frame 2 (test-charge frame):
Wire is charged and carries a current. Test charge is at rest. Electrostatic force on test charge is non-zero because the wire is charged. Magnetic force on test charge is 0 since charge is not moving.