11/30/09
The PHY 2B Final Exam will be held in YORK 2722 on Wed. Dec. 9 3:00 PM - 6:00 PM.
There will be 12 problems. You are allowed to bring with you TWO 8 1/2 X 11 (both sides) cheat sheets instead of one as in the Quizzes.
The grading for the course will be: A > 70% ; B > 50% ; C > 35%
The TA, Nick Schafer, will review the material for the whole course on Wed. and Fri. this week at the usual time (2 PM -2:50 PM) and place ( YORK 2722) for lectures.
11/24/09
Since Thursday is Thanksgiving, I will hold office hours in my office MHA 4561 on Tuesday, Nov. 24 from 2 PM - 3 PM and on Wednesday, Nov. 25 from 11 AM to Noon for anyone who wishes to see me.
The final Quiz ( Quiz 8) on Tuesday, Dec. 1 will be on Chapters 32 and 33. We will discuss the material in Chapter 34 but it will not be tested in the Final.
There will be a combined, 2 hour discussion/problem session on Monday night, November 30th from 7:00-8:50 pm in 2005 Warren Lecture Hall. We will cover the material relevant to your last quiz (Chapters 32 and 33). There will be a short review of material but most of the time will be reserved for working examples and asking questions on homework, so come prepared (i.e. having read the chapters and attempted the homework problems).
11/13/09
I was wrong in Friday's lecture when I said the magnetic field inside the coils is independent of the radial distance from the center. In fact, it goes like µ0 N I / (2πr) where r is the distance from the center of the toroid. So, unlike an infinite solenoid the field is not constant inside the coils, although it is everywhere parallel, and zero outside the coils. My apologies!
I will not be able to hold office hours next Thursday 2 PM - 3PM, so please contact me by email if you need help next week so we can schedule it.
11/12/09
THERE WILL BE NO QUIZ THIS FRIDAY, NOV. 13. Instead there will be a regular class lecture.
Quiz 7 will be given on Friday, Nov. 20 ( usual place and time) and will cover Chapters 30 and 31. Quiz 8 will be given after Thanksgiving on Tuesday, Dec. 1during the evening class lecture period in SOLIS 107.
10/29/09
For this Friday's Quiz, you will need to remember Ohm's Law , expression for power dissipated in a resistor, expression for resistances in series and in parallel, how to use Kirchoff's Laws (remember circuit equation for each loop of the circuit, i.e. (EMF in circuit - drop in voltage across all resistors in circuits (using Ohm's Law and taking into account the little loop currents in various legs of the circuit and keeping track of their signs) = 0 )--this will give you simultaneous equations you can solve to get the loop currents-- and the expressions in an RC circuit for the current as a function of time; the voltage across the capacitor as a function of time; and the circuit equation (EMF) - IR -q/C = 0
Professor Sinha will be away on Monday, Nov. 2. Lecture will be given by Professor Schuller.
10/23/09
Professor Sinha will not be here on Monday, Oct. 26. The 2 PM lecture in YORK 2722 will be given by Professor Wu. Professor Sinha will be back for the Tuesday evening lecture.
10/08/09
Professor Sinha will be away the week of Oct. 12. Lectures (by substitutes) , discussion and problem sessions will be held at the usual times and places. Quiz 3 will be as usual on Friday, Oct. 16.
Quiz 3 will cover Chapter 25 only.
10/01/09
There will be no Problem Session this week due to unavailability of space. The Discussion Section will still be held at its normal time and location.
9/30/09
There are at least two errors in Chapter 23 of Wolfson and Pasachoff's Physics for Scientists and Engineers (the text we are using):
1) On page 574 and 575 they first pose (on page 574, at the end of Example 23-1) and then solve (on page 575) an Exercise asking you to find the force on a charge. The answer is given as mN (10-3) but should instead be cN (10-2).
2) On page 577, Example 23-2, under the Solution section the final term is missing a "y" in the numerator that was simply not carried over from the expression in the middle. As such, evaluating F at y=0 (as they suggest) does NOT give 0. If only they had taken their own advice! You can also tell that this answer does not make sense because the units are wrong, being N/m rather than N.