Exam 15: Electromagnetism

A magnetic field is always associated with an electric current.

The ampere-turns of mmf specify the magnetizing force, but the intensity of the magnetic field depends on the length of the coil.

Reducing the residual induction is a method of demagnetization called ______________.

A ______________ is an electromechanical device that operates switching contacts by electromagnetic induction.

In what device is motion supplied so that the flux and conductor can cut across each other to induce voltage across the ends of the conductor?

The mmf of a coil is directly proportional to both the current and the number of turns.

The effect of much change in flux density, when the field intensity increases, is called saturation.

The movable arm of an electromechanical relay is called the