Exam 13: Electromagnetism

Which has the greatest effect on increasing the flux density within a current-carrying coil?

Motors, moving-coil measuring instruments, and dynamic loudspeakers all work on the principle of

The 'direction' of lines of magnetic flux are determined by the direction a __________ would point when placed within the field

A conductor that carries an electric current is surrounded by a

A dot shown within a circle representing an end-on view of a conductor is the convention used to indicate that current is

If each of two parallel conductors carry currents flowing in the same direction, then the two conductors

Flux density is defined as the

A current-carrying conductor, placed within a permanent magetic field, will be forced out of that field. This is an example of

The components of a d.c. motor which ensure that the rotor continues to rotate in the same direction are the

The SI unit of measurement for magnetic flux density is the

For conventional flow, the direction of the magnetic field surrounding a straight conductor can be determined using the

The magnetic polarity of a coil, around which conventional current direction is known, may be determined using

The SI unit of measurement for magnetic flux is the

What is the magnetic polarity of the visible face of a loop of wire, around which conventional flow is counter-clockwise?

Magnetic flux density is at its greatest __________ the poles of an electromagnet

When using Fleming's Left-Hand Rule, the first finger represents __________, the second finger represents __________, and the thumb represents __________