WE 3 Electronics - Electromagnetics / Electronic Devices and Circuits

In a magnet, what do you call the point in which the magnetic lines of force is maximum?

Magnetic pole

A magnetomotive force is supplied by a current of one ampere through 100 turns. The magnetic circuit consists of a steel core of 1000 permeability, 10 cm long and 4 sq. cm area and an air gap one cm long. What is the field intensity at the air gap?

124.4 Oe

An electric field is most directly related to the:

force acting on a test charge

What nonmetallic materials have ferromagnetic properties?

Ferrites

Two thin spherical shells, one with radius R and the other with radius 2R, surround an isolated charged point particle. The ratio of the number of field lines through the larger sphere to the number through the smaller is:

1

Hydrogen is an example of a ___ material.

diamagnetic

A current of 10 A in a coil of 1000 turns produces a flux of 10 mWb linking with the coil. What is the coil inductance?

1 H

Sample

10⁶ H