Magnetic Field
Ampere's (circuital) Law
Basis of electromagnetism
Electromagnetic Force (Lorentz Force)
Basis of motor
A current-carrying wire in the presence of magnetic field has force induced on it
Faraday's Law
Basis of transformer
Second Newton's Law for Rotation
Circular magnetic field follows right-hand grip rule
Magnetic Field, H = i / (2πr) (Unit: A/m)
Magnetic field produces when current flow in a wire
A time changing magnetic field induces voltage in a coil of wire if it passes through the coil
Time varying flux causes an induced emf to occur
Some flux leaks into surrounding air
Uses Fleming's left-hand rule
F is perpendicular to the plane formed by v and B
F = I (l x B)
A moving wire in the presence of a magnetic field has a voltage induced in it
Basis of generator
Uses Fleming's right-hand rule
Net external torque = moment of inertia x angular acceleration
Changes mechanical energy to electrical energy
Changes electrical energy to mechanical energy