Electromagnetic Induction

Magnetic flux (ΦB) through a surface

Magnetic flux (ΦB) through a surface is defined as ΦB = B⋅A = BA cos θ, where B is the magnetic field, A is the area vector, and θ is the angle betwee

The magnitude of induced EMF

The magnitude of induced EMF in a circuit equals the time rate of change of magnetic flux through the circuit. Mathematically: ε = -dΦB/dt. For a coil

The polarity of induced EMF

The polarity of induced EMF is such that it tends to produce a current which opposes the change in magnetic flux that produced it. This law ensures co

When a conductor of length l

When a conductor of length l moves with velocity v perpendicular to a uniform magnetic field B, the induced EMF is ε = Blv. This can be explained usin

When current in one coil induces

When current in one coil induces EMF in a nearby coil, the proportionality constant is mutual inductance (M). For two coils: ε₁ = -M₁₂(dI₂/dt). Import