Finals Reviewer

Question 1

Force exerted by magnets when they attract or repel each other. It is caused by the moving electric charges.

Answer 1

Magnetism

Question 2

Can be defined as the attractive or repulsive force that is exerted between the poles of a magnet and electrically charged moving particles.

Answer 2

Magnetic Force

Question 3

Is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials.

Answer 3

Magnetic field

Question 4

It represents Magnetic Field by continuos line that emerge from north-seeking magnetic poles and enter south-seeking magnetic poles.

Answer 4

Magnetic Flux

Question 5

Is a measurement of the total magnetic field which passes through a given area. It is measured in units of Weber.

Answer 5

Magnetic Flux

Question 6

It is a measure of the intensity of a magnetic field in a given area of that field a measure of the intensity of a magnetic field in a given area of that field. It is represented by “H”

Answer 6

Magnetic Field Strength

Question 7

What is magnetic field strength typically measured in, as defined by the Intl. System of Units?

Answer 7

Amperes per meter (A/m)

Question 8

What is a physical constant used often in electromagnetism?

Answer 8

Permeability of free space

Question 9

What is the formula for Magnetic Permeability Constant?

Answer 9

μ0 = 4π x10-7 T • m/A

Question 10

What is the visual tool used to represent magnetic fields. They describe the direction of the magnetic force

Answer 10

Magnetic Field Lines

Question 11

Inside the magnet, what is the direction of the magnetic field lines?

Answer 11

South pole to North Pole

Question 12

TRUE OR FALSE:

Magnetic field lines always intersect with each other.

Answer 12

FALSE. Never

Question 13

TRUE OR FALSE:

Magnetic field lines form a closed loop.

Answer 13

TRUE.

Question 14

TRUE OR FALSE:

Field lines have direction and no magnitude at any point on the field.

Answer 14

FALSE. It has both magnitude and direction.

Question 15

TRUE OR FALSE:

Magnetic field lines in the same direction, weakens the magnetic effect.

Answer 15

FALSE. Strengthen.

Question 16

What is the branch of Physics, that deals with the electromagnetic force that occurs between electrically charged particles.

Answer 16

Electromagnetism

Question 17

What is one of the four fundamental forces and exhibits electromagnetic fields such as magnetic fields, electric fields, and light.

Answer 17

Electromagnetic force

Question 18

He calculated the speed of an electromagnetic wave and found that the speed of an electromagnetic wave was almost identical to the speed of light. (3×108 m/s)

Answer 18

James Clerk Maxwell

Question 19

What did James Maxwell discovered with the lights?

Answer 19

Light was an electromagnetic wave.

Question 20

He demonstated that these are the two manifestations of the same phenomenon.

Answer 20

Electric and Magnetic Field

Question 21

He demonstrated that the electromagntic waves predicted by James Maxwell actually exist.

Answer 21

Heinrich Hertz

Question 22

It states that the total electric flux out of a closed surface is equal to the charge enclosed divided by the permimttivity.

Answer 22

Gauss Law

Question 23

It is defined as the combination of the magnetic and electric force on a point charge due to electromagnetic fields.

Answer 23

Lorentz Force

Question 24

It is the opposition to alternating current presented by the combined effect of resistance and reactance in a circuit

Answer 24

Impedance

Question 25

It is an electric circuit composed of resistors and inductors drived by a voltage or current source.

Answer 25

Resistor-Inductor Circuit (RL)

Question 26

It is a type of electric circuit that is made up of an inductor which is expressed by the letter L and a capacitor represented by the letter C.

Answer 26

LC Circuit

Question 27

The ENTIRE range of EM waves in order of increasing frequency and decreasing wavelength.

Answer 27

EM spectrum

Question 28

What happens to the wavelengths and frequencies, as you go from left to right of the inverse relationship between size and frequency?

Answer 28

Wavelengths get smaller and Frequencies get higher.

Question 29

What has the longest wavelength and lowest frequency; with its wavelength ranging from 1000s of meters to .001 m?

USED IN: RADAR, Cooking food, satellite transmission

Answer 29

Radio waves

Question 30

What has a shorter wavelength, from .001 m to 700 nm, and has a higher frequency.

USED IN: TV remote control devices

Answer 30

Infrared waves (heat)

Question 31

What has the wavelength that (red light) and 30 nm (violet light) with frequencies higher than infrared waves and a very small part of the EM spectrum?

Answer 31

Visible light

Question 32

What has the wavelength that ranges from 400 nm to 10 nm; its frequency (and therefore energy) high enough penetrating living cells and cause them damages.

Answer 32

Ultraviolet Light

Question 33

What has the wavelength from 10 nm to .001 nm that has rays with enough to penetrat deep into tissue?

Answer 33

X-Rays

Question 34

What ray carries the most energy and shortest wavelengths, less than one trillionth of a meter (10-12) that needs a 3-4 ft. thick concrete wall to stop them?

Answer 34

Gamma rays