19.2 Magnetic Forces and Currents

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Magnetic Forces and Currents

MAGNETIC FIELDS AND FORCES & CONDUCTORS
Magnetic Force on a Current-Carrying Wire
F = B I l sinθ          B = magnetic field
                              I = current
                              l = length
                              θ = angle between I and B
Magnetic Field Due to a Current Carrying Wire
B = µ0 I / 2 π r        µ0 = 4π×10-7 T • m / A
                              I = current
                              r = distance from wire
Torque on a Current-Carrying Loop
τ = BIANsinθ           B = magnetic field
                               I = current
                               A = area
                               N = number of turns
                               θ = angle between B and the normal


• Torque is at a maximum when the plane of the loop is
parallel to the magnetic field.