Module 16: Magnetism

Question 1

Define Diamagnetic Substance

Answer 1

A substance that is made up of atoms with no net magnetic field.

Question 2

Define Paramagnetic Substance

Answer 2

A substance whose magnetic atoms are arranged so that their individual magnetic fields cancel out. Under the influence of an external magnetic field, however, these substances produce a magnetic field that is in the same direction of the external magnetic field.

Question 3

Define Ferromagnetic Substance

Answer 3

A substance who’s magnetic atoms are aligned so that their magnetic fields add to one another.

Question 4

What is the right-hand rule?

Answer 4

The direction of the magnetic field lines for a current-carrying wire can be determined by pointing the thumb of your right hand in the direction of the current. Your fingers will curl in the direction of the magnetic field lines.

Question 5

Define Elctromotive force (emf):

Answer 5

The potential difference between two sides of a battery when no current flows.

Question 6

Define Faraday’s Law of Electromagnetic Induction

Answer 6

The electromotive force in a loop of wire is proportional to the rate of change of magnetic flux through the loop

Question 7

Define Alternating Current

Answer 7

Electrical current that changes direction back and forth in a circuit

Question 8

Define Direct Current

Answer 8

Current that always flow in the same direction around a circuit

Question 9

What is the rule of poles?

Answer 9

Like magnetic poles repel one another, while opposite magnetic poles attract one another

Question 10

What another word for Magnet?

Answer 10

Dipoles

Question 11

Can a magnet exist as a monopole?

Answer 11

No, a magnet will always exist as a dipole, meaning that nay magnet will always have a north and a South Pole.

Question 12

What are the guidelines for drawing magnetic field lines?

Answer 12

1. Magnetic field lines come out of north poles and go into south poles
2. The direction of the magnetic field lines tells you the direction that the North Pole of a magnet will point if it is placed in the field and is free to move, and the density of lines tells you the relative strength of the magnetic field
3. Magnetic field lines can never cross

Question 13

What are Domains?

Answer 13

Clusters of atoms that align their magnetic fields in a material, acting as a magnet

Question 14

What’s the abbreviation for Effective voltage?

Answer 14

Effective voltage rms voltage