Exam 4 Magnetics and such

Question 1

Magnetic Pole

Answer 1

The physical quantity that exerts magneto-static forces on one another.

Question 2

Magnetic Dipole

Answer 2

Molecular arrangement of separation between north and south poles in an object. Always has net zero magnetic pole.

Question 3

Magnetic Pole SI Unit

Answer 3

Ampere meter = Am

Question 4

Force between 2 poles

Answer 4

Question 5

Permeability of Free Space

Answer 5

4π

Question 6

Magnetic Polarization

Answer 6

Individual molecules reorient themselves such that their north magnetic poles face one direction and the south another.

Question 7

Ferromagnetic

Answer 7

Individual atoms/ molecules are actively and unavoidably magnetic. Subject to magnetic polarization.

Question 8

Megnetic Domain

Answer 8

A small microscopic section of a material with a net magnetic pole. In steel these domains are cancelled by adjacent domains such that the steel overall has no magnetic property.

Question 9

Magnetization

Answer 9

The reorientation of magnetic domains to create net magnetic effect.

Question 10

Soft/ hard magnetic material

Answer 10

Material that easily/not easily demagnetizes when all adjacent poles are removed.

Question 11

Magnetostatic Force

Answer 11

Question 12

Magnetic Field SI Unit

Answer 12

Tesla

Question 13

Tesla

Answer 13

N*A*m = T

Question 14

Electromagnet

Answer 14

Any object that becomes magnetized when an electric current is introduced

Question 15

Power wasted as thermal energy

Answer 15

Power consumed = voltage drop * current = current^2 * resistance

Question 16

Superconductor

Answer 16

Material with no electrical resistance

Question 17

Root Mean Square Voltage

Answer 17

Nominal AC voltage

Question 18

Transformer

Answer 18

Uses the connections between electricity and magnetism to convey power from one AC current to another.

Question 19

Magnetic Induction

Answer 19

Change in magnetic field causes electric field

Question 20

Lenz’s Law

Answer 20

When a changing magnetic field induces a current in a conductor, the magnetic field from that current opposes the change that is induced in it.

Question 21

Inductor

Answer 21

A coil that has a natural opposition to current change.

Question 22

Secondary Voltage

Answer 22

Primary voltage * secondary turns/primary turns

Question 23

Secondary Current

Answer 23

primary current * primary turns/secondary turns