PHY136H5 Lecture Notes - Short Circuit, Electrical Network, Ammeter
Document Summary
A current-carrying wire will create a magnetic field in the space around it. If a second current- carrying wire is placed in this magnetic field, it will experience a magnetic force. Two parallel wires carrying currents in the same direction attract each other. Ba is the magnetic field at wire b d produced by the current in wire a. fba is the resulting force acting on wire b fba because it carries current in field ba . ia b. Fba = ibl ba ib l where vectors l and ba are perpendicular, and ba (due to ia) Figure 1: parallel currents attract, and antiparallel currents repel where o is a constant, called the permeability constant, whose value is defined to be exactly. O=4 10 7 t. m/a, d is the distance between the two wires (center to center), and l is the length of the wires.
