A current-carrying wire in a magnetic field feels a force, F = BIL sinθ, where θ is the angle between the current and the field. The force is perpendicular to both, given by Fleming's left-hand rule. Change B, I, L and the angle and watch the force respond, including the moment it vanishes.
MissionRotate the wire until it is parallel to the field, then predict the size of the force.Streak 0Best 0
When the current is parallel to the magnetic field, the force on the conductor is:
flux density B0.40 T
current I , length L5 A , 0.20 m
angle to field θ90°
force F = BIL sinθ0.40 N
F is greatest when the current is perpendicular to the field (θ = 90°) and zero when parallel (θ = 0).