Fall 2008

# assignments

Homework assignments are due at the beginning of each class on Tuesday.
Please turn in neatly-written, readable solutions. You should show all of your work and take the time to explain what you are doing (in complete sentences!) and why.
Late work will NOT be accepted without prior arrangement.

due Tue Sep 9

## Homework 1

• Problems from Understanding Physics
• 22.3
• 22.5
• 22.8
• A typical lightning bolt carries a current of about 100,000 amps and lasts for about a millisecond. How much charge is moved? How many electrons is this?

due Tue Sep 16

## Homework 2

• Show that, at fixed separation a, the maximum repulsion between two point charges of total charge Q occurs when each charge equals Q/2.
• Problems from Understanding Physics
• 22.11
• 22.13
• 22.16
• 22.37
• 22.47

due Tue Sep 23

## Homework 3

• In class we calculated the Electric Field at a height z above an infinite plane of uniform surface charge density σ by breaking the plane into a series of rings. Repeat the calculation by breaking the plane up into a series of infinitely long strips of charge. Make sure you get the same answer as we derived in class.
• Problems from UP
• 23.32
• 23.39
• 23.50
• 23.51
due Tue Sep 30

## Homework 4

• A cylindrical shell of inner radius a and outer radius b contains a uniform total charge per unit length λ .
• Find the charge density ρ in terms of a, b, and λ .
• Find the electric field for r<a, a<r<b, and b<r.
• Consider two concentric, thin conducting shells, of radii r1 < r2 and positive charges Q1 and Q2 .
• Find the charge densities on their inner and their outer surfaces.
• If a charge Q3 > Q2 is brought up from infinity to just outside r2 , how does this affect the charge densities qualitatively?
• Problems from UP
• 24.32
• 24.35
• 24.42
• Not graded, but suggested: 24.19

• MORE THOUGHTS ON PROBLEM 2 ABOVE
• Assume the shells are both spherical in nature, and are not infinitely thin, simply thin enough to use the same radius for both the inner and outer radii of each shell. Then compute the charge density on both the inner and outer surfaces of each shell by using your knowledge of the Electric Field in the interior of a conductor.

due Tue Oct 7

## Homework 5

• Problems from UP
• 25.3
• 25.20
• 25.23
• 25.39
• 25.49
due Fri Oct 17

## Homework 6

• Problems from UP
• 26.26
• 26.35
• 27.11
• 27.18
• 27.33
• 27.55
• 27.73
• Problems from UP chapter 28, "Capacitance"
• 28.8
• 28.33
• 28.49
due Fri Oct 24

## Mid Term Exam

• In class. Details to be discussed during prior class.
due Tue Nov 4

## Homework 7

• Problems from UP Chapter 29
• 29.8
• 29.18
• 29.23
• 29.31
• 29.49
due Tue Nov 11

## Homework 8

• Problems from UP Chapter 30
• 30.11
• 30.14
• 30.39
• 30.50
• 30.59
• 30.75
due Tue Nov 18

## Homework 9

• Problems from UP Chapter 31
• 31.26
• 31.36
• 31.46
• 31.55
• 31.73
due Tue Nov 25

## Homework 10

• Problems from UP Chapter 32
• 32.9
• 32.17
• 32.30
• 32.31
• 32.41
due Sat Dec 13

## Final Exam

http://cs.marlboro.edu/ courses/ fall2008/e_and_m/ special/assignments