Deck 12: Electromagnetism

Question 1

The magnetic polarity of the coil is determined by placing the fingers of the ____________________ hand in the direction of current (electron movement) as it exists through the turns of wire. The thumb will point in the direction of the N pole.

Answer 1

left

Question 2

List the three factors that determine the magnetic strength of a current-carrying coil.

Answer 2

The magnetic strength of a coil depends on: 1) the amount of current in the coil; 2) the number of turns in the coil; and 3) the type of core material used.

Question 3

The accompanying figure shows the symbol for "current in" in the dot-cross method of indicating current direction.

Answer 3

False

Question 4

A straight current-carrying conductor has a magnetic field with north and south poles.

Question 5

Magnetic strength can be expressed in ____________________ for a given core material.

Question 6

The accompanying figure shows the symbol for "current in" in the dot-cross method of indicating current direction.

Question 7

In most cases, the magnetizing force in a magnetic circuit is produced by the effects of an electrical current in a coil with a(n) ____________________.

Question 8

The ____________________ can be used to determine the direction of conductor flux.

Question 9

Compare the magnetic flux patterns of a bar magnet and a straight current-carrying conductor. What needs to be done to a straight current-carrying conductor so that the conductor flux replicates the flux of a bar magnet?

Question 10

The more current there is through a coil, the weaker the magnetic field will be.