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Flashcards in The Magnetic Field 2 Deck (16)
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1

What produces magnetic fields?

moving charges themselves

2

mew naught

Permeability of free space

3

Solenoid

A tightly wound helical coil of wire. When current is passed through, the magnetic field is uniform inside the helix (an electromagnet).

4

Solenoid Rule

Curl right hand fingers in the direction of the current. Thumb points to north pole.

5

N

# of turns

6

A current loop is

a magnetic dipole (like a bar magnet).

7

r hat

unit vector from ds to point P

8

Curl fingers in direction of B. thumb points to...

velocity vector/current vector

9

Units of B

Gauss

10

1 gauss =

10^4 T

11

Ideal Solenoid

External field is 0, internal field is uniform

12

Ideal solenoid is a great approximation when...

Solenoid's length is much greater than its diameter.

13

RHR for solenoids

Curl fingers along current, thumb = B

14

Magnetic flux is always 0 for what? Why?

for closed surfaces. B field lines always form closed loops. Magnetic monopole does not exist.

15

Current

Flow of positive charge

16

Atomic Magnet

Magnetic moment due to electron's orbital motion