Chapter 28 Concepts - Magnetic Field

Question 1

Define an electromagnet

Answer 1

moves electrically charged particles, creating a magnetic field

Question 2

Discuss magnetic force and its directionality

Answer 2

When a charged particle moves through a magnetic field, a double blank acts on the particle.
The direction of double blank is always perpendicular to the direction of the particle’s blank

Question 3

Discuss magnetic force directionality relative to charge and velocity

Answer 3

Magnetic force is zero when blank is zero or if the particle is stationary
Magnetic force is zero if blank and blank are either parallel or antiparallel
Magnetic force is at its maximum when blank and blank are perpendicular to each other

Question 4

What quantity can magnetic force never change and why?

Answer 4

Magnitudes of particle speed and kinetic energy because it will never have a component parallel to these quantities

Question 5

What are the magnetic field units?

Answer 5

1 (Newtonsecond)/(Coulombmeter) = 1 Tesla (T)

ALSO: 1 Tesla = 10^4 Guass (G)

Question 6

Discuss the distinction between the north and south poles of a magnet

Answer 6

blank is the end of the magnet from with the field lines emerge whereas blank is where the field lines enter the magnet

Question 7

what is a magnetic dipole

Answer 7

magnets because they also have two poles; they can not be separated

Question 8

what is the basic law of magnets?

Answer 8

opposites attract, like poles repel

Question 9

define crossed fields

Answer 9

when you have two fields perpendicular to each other

Question 10

discuss the hall effect

Answer 10

allows us to find out whether the charge carriers in a conductor are positively or negatively charged; allowing you to measure the number of such carriers per unit volume of the conductor

Question 11

discuss cyclotrons/synchrotrons

Answer 11

two types of ACCELERATORS that employ a magnetic field to repeatedly bring particles back to an accelerating region where they gain more and more energy until they finally emerge as a high-energy beam

Question 12

describe magnetic dipole moment

Answer 12

we use this to account for the torque on the coil due to a magnetic field; units: 1 A*m^2 -OR- 1 J/T

Question 13

discuss potential energy minimums and maximums (what causes it?)

Answer 13

• blank* happens when magnetic dipole moment and magnetic field are parallel
• blank* happens when magnetic dipole moment and magnetic field are antiparallel