19.3 Physics

Question 1

When do charges experience the maximum magnetic force upon moving through a magnetic field?

Answer 1

When the charges move perpendicular to the magnetic field.

90 degrees

Question 2

When do charges experience a lower in magnetic force upon moving through a magnetic field?

Answer 2

When it’s at any angle other than 90 degrees

And becomes zero when it’s 180

Question 3

When do charges experience no magnetic force upon moving through a magnetic field?

Answer 3

When they move along the field lines (when the angle is 0.)

Question 4

How can we describe the properties of the magnetic field B?

Answer 4

We can describe it in terms of magnetic force exerted on a positive test charge at a given point.

Question 5

How do you find the magnitude of a magnetic field?

Answer 5

B = Fmagnetic/qv

Question 6

What are the units of magnetic field, force, charge, and velocity?

Answer 6

Tesla (N/Cxm/s), Newtons, Coulomb, and meters per second.

i think these are the SI units

Question 7

What’s the magnitude of most magnetic fields?

Answer 7

Less than 1T

Question 8

What is the magnitude of some superconducting magnets?

Answer 8

30T

Question 9

What’s Earth’s magnetic field near its surface?

Answer 9

It’s about 50 micro T (5x10^-5 T)

Question 10

What is the alternative hand rule?

Answer 10

It’s a deviation from the original right hand rule that can be used to find the direction of the magnetic force.
Check page 674.

Question 11

If the charge is negative rather than positive, which direction is the force pointed?

Answer 11

It’s pointed in the opposite direction of what’s in the alternative right hand rule.

Question 12

Solve page 675

Question 13

What’s the path that a charge follows upon going through a magnetic field?

Answer 13

It follows a circular path

Question 14

The magnetic force is always directed toward…

Answer 14

*the center of the circular path *

Question 15

Answer your questions page 676

Question 16

The resultant force on a current-carrying wire equals what?

Answer 16

It equals the sum of the individual magnetic forces on the charged particles.

Question 17

How is a magnetic field transmitted to the particles in a wire?

Answer 17

Through the collisions with the atoms making up the bulk of the wire

Question 18

What’s the equation of force on a current-carrying conductor perpendicular to a magnetic field?

Answer 18

Fmagnetic = BIL

L = length of conductor within B

Question 19

How do you use the right hand rule for a current-carrying conductor in a magnetic field?

Answer 19

By doing the same thing as you’d do normally, but placing your thumb in the direction of the current instead of the direction of velocity.

Question 20

When the current is either in the direction of the field or opposite, the magnetic force on the wire is…

Answer 20

zero

Question 21

When two conductors are parallel to each other, what is the direction of the magnetic field created by them?

Answer 21

One is perpendicular to the direction of the current of the other, and vice versa.

Question 22

What happens to wires when the current in each is in the same direction?

Answer 22

They attract eachother

Question 23

When the wires are in opposite directions, do they repel or attract eachother?

Answer 23

They repel

Question 24

What do loudspeakers do to produce sound?

Answer 24

They use a magnetic force acting on a current-carrying wire in magnetic field to produce sound waves

Question 25

The force between parallel conducting wires are always what to eachother?

Answer 25

Opposite

Question 26

Solve page 678 and 679