Magnetism

Question 1

What are examples of magnets?

Answer 1

1) Wand
2) Horseshoe
3) Bar
4) Ring

Question 2

The three magnetic materials are…

Answer 2

1) Ferromagnetic
2) Paramagnetic
3) Diamagnetic

Question 3

What do you call metals that can be easily magnetised?

Answer 3

Ferromagnetic (e.g., iron, nickel, cobalt, and manganese).

Question 4

What do you call metals that cannot be easily magnetised?

Answer 4

Paramagnetic (e.g., platinum, titanium, and chromium).

Question 5

What do you call metal or nonmetallic materials that cannot be magnetised?

Answer 5

Diamagnetic (e.g., copper, brass, and antimony).

Question 6

What is ALNICO?

Answer 6

1) Aluminium
2) Nickel
3) Iron
4) Cobalt

Question 7

_ can attract magnets and _ materials.

Answer 7

Magnets, magnetic

Question 8

All magnets are _, but not all metals are _.

Answer 8

metals, magnetic

Question 9

What is magnetism?

Answer 9

The push/pull forces between like/unlike poles.

Question 10

Magnetism is due to the…

Answer 10

arrangement of electrons.

Question 11

It is closely related to electricity.

Answer 11

Magnetism.

Question 12

Every magnet has one _ and _ pole.

Answer 12

north, south

Question 13

The blue end of a magnet is the north pole while the red end is the south pole.

Answer 13

False.

Question 14

It is the part of the magnet where the magnetic effects are strongest.

Answer 14

Magnetic poles.

Question 15

How is magnetism different from electricity?

Answer 15

Magnetic monopoles do not exist when it is possible to have separate positive and negative charges.

Question 16

Magnetic monopoles exist.

Answer 16

False.

Question 17

A charge cannot experience a magnetic force when placed in a magnetic field.

Answer 17

False.

Question 18

What are the 2 conditions for charges to experience a magnetic field?

Answer 18

1. It has to be moving
2. It has to have a component of velocity perpendicular to the magnetic field

Question 19

The form of the
magnetic force on a moving charged particle is given by the equation…

Answer 19

F = q0v × B

F - magnetic force
q0 - charge of particle
v - velocity of particle
B - magnetic field

Question 20

Magnetic Forces on Charges: The _ of the _ can be obtained by using the definition of the vector cross product.

Answer 20

magnitude, force

Question 21

What is the equation to find the magnitude of the magnetic force on a charge?

Answer 21

F = q0vBsinθ

θ - angle between v and B

Question 22

The magnitude of the magnetic field can be defined similar to that of the electric field by the equation…

Answer 22

B = F / q0vsinθ

Question 23

As a vector, a magnetic field can be determined using a _ or the _ _ _ of vector multiplication.

Answer 23

compass, right hand rule

Question 24

The unit of magnetism is…

Answer 24

Tesla (T), from N • s / C • m

Question 25

The magnitude of the field due to a long straight wire is defined by _ law where…

Answer 25

Ampere’s; B = µ0 • I / 2πr

µ0 - permeability of free space = 4π • 10^-7 T-m/A
r - perpendicular distance from the wire’s side

Question 26

What is the equation for magnetic force?

Answer 26

F = I • L • B • sinθ

Question 27

What is the equation for a magnetic field along the center of a circular current loop?

Answer 27

B = N (µ0 • I / 2 • R)

N - number of turns of the wire
R - radius of the loop

Question 28

According to Newton’s second law, the equation for acceleration is…

Answer 28

a = F / m

Question 29

What does Ampere’s law state?

Answer 29

Wherever a current passes through a conductor, a magnetic field is produced around it.

Question 30

Current and magnetic fields are _ quantities.

Answer 30

vector

Question 31

The magnetic field due to one or more straight wire conductors is _ proportional to electric current and _ proportional to r.

Answer 31

directly, inveresely