CYU Flashcards Preview

Physics 10 > CYU > Flashcards

Flashcards in CYU Deck (23):
1

magnetic field start in the x and are terminated in the x

north, south

2

two magnetic poles:

N & S

3

Like poles x and unlike poles x

repel, attract

4

Can a resting electron interact with magnetic field?

no.

5

Can a moving electric charge interact with magnetic field?

Yes.

6

If a magnetic field exerts a force on a current,

that force is directed at a right angle to the current direction

7

Charged particles from sun are trapped by earth B field?

Aurora

8

What fundamental fact underlies operation of electric motors?

A current-carrying conductor placed perpendicular to a magnetic field will experience a force

9

Counterclockwise current

regular fountain

10

clockwise current

inverted fountain

11

what is the source of all magnetism?

current moving charge

12

permanent bar magnet has b field. b field is due to

current in atom/electron motion

13

What is the cause of earth's magnetic field?

current: outer core (liquid iron) + rotation of earth

14

source of all magnetism:

current

15

why will heating a magnet weaken it?

randomize alignment

16

Describe ampere's law

current creates magnetic field (electromagnetic)

17

Describe faraday's law

moving magnet changes electric field

18

There is an oscillating magnetic field inside the loop. What happens in ammeter?

move magnet, put coil nearby and current transfers

19

If there is current in coil even though no current source (ex. battery) is connected to coil, what is the source of the current?

electromagnetic induction
1. move permanent magnet
2. move coil

20

in order to make changing b field

move magnet near wire or move coil near magnet or changing current in nearby wire. this is ampere's

21

rapid change of a magnetic field induces

electric field

22

name of device that transforms mechanical energy into electrical energy?

generator

23

electromagnetic induction can occur in three ways:

move magnet near wire, move coil, change current in nearby wire