The magnetic force on a charge q moving with velocity v in field B is:

Faraday's law of EMI states that induced EMF equals:

A circular loop of radius r carries current I. Magnetic field at centre:

Self-inductance of a solenoid with N turns, length l, area A is:

A charged particle moves in a circle in a magnetic field. The radius of the circle is:

Lenz's law is a consequence of conservation of:

The magnetic field inside a solenoid is:

In an AC circuit with only capacitor, current:

Resonant frequency of an LC circuit is:

Eddy currents are reduced by:

The direction of induced current is given by:

A transformer has 100 primary turns and 500 secondary turns. If primary voltage is 220V, secondary voltage:

Moving coil galvanometer is based on:

Biot-Savart law gives magnetic field due to:

The power factor of a pure resistive AC circuit is:

Mutual inductance between two coils depends on:

In a step-down transformer:

Ampere's circuital law relates:

The energy stored in an inductor carrying current I is:

Diamagnetic materials have susceptibility: