Physics Midterm part 3

Question 1

Ferromagnetic

Answer 1

These are strongly magnetic and are highly permeable and greatly susceptible to magnetic induction. Examples are iron, nickel and cobalt.

Question 2

Paramagnetic

Answer 2

Materials that will slightly increase magnetic field strength
EX: Good, aluminum, oxygen

Question 3

Diamagnetic

Answer 3

These materials will slightly decrease magnetic field strength by repelling magnetic lines of force. Examples include beryllium, bismuth, copper, carbon and lead.

Question 4

Non-magnetic

Answer 4

Have no attraction to a magnetic field and have no susceptibility.

Question 5

Electrostatics

Answer 5

the branch of physics that deals with stationary or resting electrical charges.

Question 6

Positive

Answer 6

Objects that emit electromagnetic lines of force or areas that have a deficiency of electrons

Question 7

Negative

Answer 7

Objects that draw in electromagnetic lines of force or areas with an overabundance of electrons

Question 8

Electrification

Answer 8

is the process of creating a positive or negative charge in a body of matter.

Question 9

Friction

Answer 9

The rubbing together of two surfaces causes friction that can remove electrons from objects.

Question 10

Contact method of electrification

Answer 10

When a charged object is allowed to touch an uncharged object, the latter will also become charged.

Question 11

Induction method of electrification

Answer 11

Surrounding every charged object is an electrostatic field.

Question 12

Ionization method of electrification

Answer 12

Ionizing radiation can remove electrons from atoms.

Question 13

Law of attraction-repulsion

Answer 13

Like or same charges will repel while unlike or opposite charged will attract.

Question 14

Field law

Answer 14

Around a charged object, there is an electrostatic field that is made up of lines of electromagnetic force.

Question 15

Coulombs law

Answer 15

The electrostatic force between two charges is directly proportional to the strength of the charges and inversely proportional to the square of the distance between them.
F = k q1 q2/r2 or d2

Question 16

Law of distribution

Answer 16

Electric charges reside only on the external surfaces of conductors.

Question 17

Law of concentration

Answer 17

The concentration of charges on a curved surface is greatest wherever the curvature is greatest.

Question 18

Law of movement

Answer 18

Only negative charges can move in a conductor.

Question 19

Grounding

Answer 19

the process of neutralizing a charged body of matter.

Question 20

Electroscope

Answer 20

A device that is used to detect the presence of an electrical charge. An electroscope can also determine if an unknown charge is positive or negative.

Question 21

Charging an electroscope by Induction

Answer 21

Bring a charged rod near the metal knob but not touch it.

Question 22

Charging an electroscope by Contact

Answer 22

Touching the metal knob with a charged rod will cause the metal leaves to separate