Download Electric Fields

yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts

Introduction to gauge theory wikipedia, lookup

History of quantum field theory wikipedia, lookup

Electrostatics wikipedia, lookup

Electric charge wikipedia, lookup

Lorentz force wikipedia, lookup

Centripetal force wikipedia, lookup

Aharonov–Bohm effect wikipedia, lookup

Speed of gravity wikipedia, lookup

Electromagnet wikipedia, lookup

Field (physics) wikipedia, lookup

Maxwell's equations wikipedia, lookup

Casimir effect wikipedia, lookup

Gravity wikipedia, lookup

Weightlessness wikipedia, lookup

Superconductivity wikipedia, lookup

Electromagnetism wikipedia, lookup

History of electromagnetic theory wikipedia, lookup

Work (physics) wikipedia, lookup

Anti-gravity wikipedia, lookup

Force wikipedia, lookup

Fundamental interaction wikipedia, lookup

Mathematical formulation of the Standard Model wikipedia, lookup

Electric Fields
Force over a distance
 Both
gravity and electric force act over a
distance without touching (unlike other
 Very difficult for early scientists to
 Michael Faraday proposed the Electric
Field to explain
Electric Field
 Force
that extends outward from any
charged object and permeates through
 Any second charged object placed
around the first charge will feel a force
of attraction or repulsion due to this field
 Tested with an imaginary positive test
charge (q)
 Magnitude
of the force acting on the test
charge can be measured
 Electric
field (E) is defined as the
amount of force (F) per unit of charge
E = F/ q
units N/C
Another Equation
E = F/ q
F = k qQ/ r2
= k Q/ r2
 Find
the magnitude and direction of the
electric field on a particle P which is
located 30 cm right of a point charge of
–3.0 x 10-6 C.
 If
the field is due to more than one
charge, the total field is the sum of the
two individuals
 Find
the total field acting on point P. If
P is a proton initially at rest, what will its
acceleration be?
20 cm
Q1 = -25μC
25 cm
Q2 = +50μC
Field Lines
 Lines
of force can be drawn to visualize
the force acting on a single point charge
 Stronger fields have more lines
 On point charges
 On double points
 Start
 On
on + and go to -
Fields and Conductors
 The
electric field inside any good
conductor is zero
- charge distributes itself evenly over the
surface of a conductor making the net
field inside zero
 Electric field is always perpendicular to
the surface of a conductor
 Excess charge tends to accumulate on
sharp points or areas of greatest
What will happen?