Homework for Week 7 (to be covered on Quiz 6)
1. Question 31.6
2. Question 31.8
3. Problem 31.12
4. Problem 31.13
5. Question 32.6
6. Problem 32.42
7. Problem 32.46
8. Problem 32.48
9. Four point charges 2
Homework 2
Phys 9C
Due April 10, 2015
Reading (Due April 6, 2015):
Read Sections 21.5 and 21.6, and 22.1 through 22.4.
Reading (Due April 10, 2015):
Read Sections 22.5 through 23.2.
Problem 1 (calculation)
Find the electric field (magnitude AND direction)
9C Midterm II
Last 6 digits of ID #
Name:
Signature:
No books or notes. Calculators OK. Show all your work below. Answers alone do not receive credit!
1. A positively charged particle (+q) is at rest in the plane
9C Homework #3 Solutions
1)
Problem 25.7 IDENTIFY and SET UP: Apply Eq. (25.1) to find the charge dQ in time dt. Integrate to find the total
charge in the whole time interval.
EXECUTE: (a) dQ = I dt
Q=
8.0s
9C Homework #1 Solutions
1)
21.8
I DENTIFY : Use the mass of a sphere and the atomic mass of aluminum to find the number of aluminum atoms in
one sphere. Each atom has 13 electrons. Apply Coulombs law and calculate the magnitude of charge q on each
s
9C Homework #6 Solutions
1)
Problem 31.12
IDENTIFY: Compare vC that is given in the problem to the general form vC =
determine .
1
SET UP: X C =
. v = iR and i = I cos t.
C R
1
1
EXECUTE: (a) X C =
=
= 1736
9C Homework #5 Solutions
1)
29.15
IDENTIFY and SET UP: The field of the induced current is directed to oppose the change in flux.
EXECUTE: (a) The field is into the page and is increasing so the flux is inc
Rules/ideas/equations from Physics 9C
1) Coulombs law for force by one point charge, qA, on another point charge, qB, is ! !" ! =
!
! !" ! = !
constant.
! !
!
!
!"
where rAB is the distance between the two point
9C Homework #7 Solutions
1)
21.90
IDENTIFY: Use Eq. (21.7) to calculate the electric field due to a small slice of the line of charge and integrate
as in Example 21.10. Use Eq. (21.3) to calculate F.
SET UP:
9C Homework #4 Solutions
1)
27.15
(a) IDENTIFY: Apply Eq. (27.2) to relate the magnetic force F to the directions of v and B. The electron has
negative charge so F is opposite to the direction of v B. For m
Homework 1
Phys 9C
Due April 3, 2015
Reading (Due April 1, 2015):
Read Sections 21.1 through 21.4.
Problem 1
How many electrons are there in your body?
Problem 2 (calculation)
How far apart must two 75kg humans, each carrying 1C of excess charge, stand if
Homework 5
Phys 9C
Due May 4, 2015
Reading (Due May 1, 2015):
Read Chapter 25.
Problem 1 (just calculate)
A piece of metal wire has resistance 1. If its stretched to three times its length, whats the new resistance?
Problem 2 (calulation)
Textbook problem
Homework 6
Phys 9C
Due June 5, 2015
Reading (Due Friday June 5, 2015):
Read Chapter 30.
Problem 1 (conceptual questions)
Q29.10, Q30.5, Q30.12,
Problem 2 (Fermi Estimate)
Magnetic fields in the sun run of order 1T. A sunspot is a concentration of magnetic
Example 22.5:
We place a total positive charge q on a solid conducting
~ at any point
sphere S with radius R (Fig. 22.18). Find E
inside or outside the sphere.
1
Example 22.8:
Two large plane parallel conducting plates are given charges
of equal magnitude
Homework 6
Phys 9C
Due May 11, 2015
Reading (Due Friday May 8, 2015):
Read Chapter 27.
Problem 1 (Fermi Estimate)
Nuclear fusion is acheived by fusion deuterium nuclei contained by magnetic fields. How fast do deuterium
nuclei need to move to overcome the
Homework 6
Phys 9C
Due May 11, 2015
Reading (Due Friday May 29, 2015):
Read Chapter 29.
Problem 1 (conceptual questions)
Answer book questions Q21.20, Q22.8, Q22.12
Problem 2 (conceptual questions)
Book questions Q23.14, Q23.17, Q24.9
Problem 3 (conceptua
9C Homework #2 Solutions
1)
23.5.
(a) IDENTIFY: Use conservation of energy:
Ka + U a + Wother = Kb + Ub
U for the pair of point charges is given by Eq. (23.9).
SET UP:
Let point a be where q2 is
We can treat the accelerating anodes as parallel plates with a voltage difference of 10 V
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