Forces in Magnetic Field

Force on Current in Magnetic Field
Left-hand rule:

Forces between Currents

Force on Moving Charges in Magnetic Field
1. Charge moves at a right angle to a magnetic field

Force on Moving Charges in Magnetic Field (cont.)
Force = 0

Torque on a Coil in a Uniform Magnetic Field

Magnetic Moment

Magnetic Flux. Gauss’s Theorem
The magnetic flux through any closed surface is zero.

Work Done on Displacement of a Wire with Current in Magnetic Field
Work done by Ampere’s force on moving a wire with current in a magnetic field, is equal to the product of the current and the increase of the magnetic flux due to the displacement of the wire.

Laws of Magnetic Circuits
Ampere’s theorem:
As Ф = const and S = const,