25.3. Model: Use the charge model and the model of a conductor
as a material through which electrons move.
Solve: (a) The charge of the glass rod decreases from 12 nC to
8.0 nC. Because it is the electrons that are transferred, 4.0 nC of
electrons has bee
Basic Vector Operations
Addition and Substraction
ax
bx
ax + b x
~
~a + b = ay + by = ay + by
az
bz
az + bz
Example:
5
0
5
5
8
13
+
=
+
=
0
4
4
3
4
7
Note: In general, ~a + ~b 6= |~a| + ~b, unless the two vectors are parallel.
Multiplicatio
Electrostatics
In your pocket:
Positive test charge
Charge distributions
create field/potential
Charge in field
-experiences force
-system has potential
energy
Field/Force
Potential/Potential energy
P
!
E (P)
P
V (P)
q
!
Fon q
q
P
!
= qEother (P)
Field/po
Massachusetts Institute of Technology
Physics 8.022 Fall 2004
Quiz #1
No books, notes or calculators allowed. All needed formulae are given below.
Please box your final answer and specify magnitude AND direction for all vectors.
Total points in t
MASSACHUSETTS INSTITUTE OF TECHNOLOGY
DEPARTMENT OF PHYSICS
Physics 8.022 Fall 2000
8.022 Electricity and Magnetism
Quiz #2
2:05-3:35 PM, Monday, Nov. 13, 2000
There are four problems worth a total of 100 points.
Answer all problems
This is a closed book
Massachusetts Institute of Technology
Department of Physics
Physics 8.022 Fall 2003
Quiz#1
Total points in the quiz are 100. ALL problems receive equal points (25 each). Work
on problems you are more comfortable with rst!
This is a closed book and clo
Massachusetts Institute of Technology
Department of Physics
Physics 8.022 Fall 2003
Quiz#2
Total points in the quiz are 100. ALL problems receive equal points (25 each). Work
on problems you are more comfortable with rst!
This is a closed book and clo
PROBLEM 1 (8 pts)
Answer the following questions, justifying your answers with one short sentence.
(a) A house has two lightning rods on its roof, one with a sphere on the end, the other with
a pointy tip.
Which gets struck by lightning more often?
(b) A
27.8. Model: The electric flux flows out of a closed surface around a region of space containing a net
positive charge and into a closed surface surrounding a net negative charge.
Visualize: Please refer to Figure EX27.8. Let A be the area of each of the
26.4. Model: The electric field at the point is found by superposition of the fields due to the two charges
located on the y-axis.
Visualize: The electric field due to the positive charge
at the point is away from
On the other hand, the
q1
q1.
electric fi