Class notes Physics Physics

5 8V.


A 25-
1 Iz F Iz
- Mult
= +
S ,
.




54(1z)

-
- SV
2 0 .
= -
5 8 .
+ 120(F) + 74(1) -




3 0 .
=
1101 F2) -
3 + 2S(F2) +
54(fz)
↓ simplify
a subsitute
1941 , -545z = 5 8 .




135)[ +=g) 54lz
,
+ = 3 +
13511 + 1911z = 3
>
h !

nation

133/
g IngCHUmA
I, =
P
+ 19153 = 3

. 04 +
4 38 9713
. +
191Fz = 3

229 97 Iz . =
- 1 04
.




Iz = -4 5 mA .

, D Ch
-3
3 -
2025
. 20
Magnetism
Magnetic Field Electric
>
-
source
charges
: in motion r
U Field Lines

ex)
[discovered in
current-carrying conductors
1820 Oersted]
g
by Hans Christian

ex) certain atoms behave like small magnets & VS .




Iron Cobalt Nickel Elements
Ferromagnetic
>
-

, ,



Permanent Magnents

⑮
· .



North to South: -


Electric Field due
outside
magnent E - -
N 4 stronger
dipole
s
to : ends

&
South to North closer to
:
-




*
inside
magnet x of the magnent
7

: shows
strength of magnetic field tangenttomagnet
is
,



magnetic field induction
>




region
[B]si T(tesla) =


By compassion
:
*
I telsa-10" Gauss (G) for lab*

eX) Bot earth-SOUT


n
E
~
-
s NIS N
3 different shapes
->
only one today:

- Magnetic Field due to Current
Carrying conductors
7
* Infinitely Long Straight Conductor

no
* cannot
magnetic monopoles"
separate North fromSouth
Y #right hand trick
Note:
medium dependent :



E= Ke
#
r
/
Mo I
magnetic
of
permeability
space free
< vector into
goes
the board Q
Vectorgestat
1
.
>
m
Mo 4 x 10-7 ⑳
B= !
= -

A
I
2πR
ME
-

.




Eo-electric 584
585/30
example 24 example
permitivity of MoI
free space B = -
B
, = B2
Fz = ?
2πr



Di
↑
=
4x10 (F) 2


2π(0 12)
=
.




0 02m
"
(25)(0 12) 48
.




0 5 x -
10 .




2( 045)
.


I .




Iz
7
45x10 4 36A
-

- - = .




0 022 .




= 30 A