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Physics is about nature. This course covers almost every concept related to physics. Important points in this lecture are: Electric Field, Force at a Distance, Test Charge, Field Strength, Point Charge, Superposition, Charge, Environmental Fields, Point Sources, Thunderstorm
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Empty space betweencharges
-^
Net force on a charge
Specific charge for a specificvalue of force
-^
Value needed for forcemagnitude
^
^
F
F
F
E
(^22)
^
^
kQr
F F^
(^22)
^
^
kQr F F^
Measured in N/C
Independent of force value
-^
Parallel to force direction
q
q F^ q
E
E
^
Magnitude comes from Coulomb’s law
(^2) r kQ
E
k^
= 8.99 x 10
9
Nm
(^2)
q^
= 10 x 10
-^
r^
= 20.0 x 10
-^
m
d^
= 1.0 x 10
-^
m
4
1 E
2 E
q^^1
2 q
^
(^2)
1
d r
kq
E
x
^
^
(^2)
2
d r
kq
E
x
^
Radio waves: 0.
-^
Living room: 3
-^
30 cm from a stereo: 90
-^
Fair weather sky: 150
-^
Shower (water on): 800
-^
Thunderstorm: 10,
-^
Cell membrane: 10,000,
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