IQ-Library Board

A special note to 303L students and other users of this library. We hope you will be an active user of the IQ-library this semester. In using the IQ-libary, if you have a query on any of the questions, please post your concerns on the board. We hope that you can be an active participant to bring to IQ-library up-to-date. Postings may include, although not limited to:

I plan to visit this board on a regular basis. However, if you need my immediate attention, in addition to submitting a posting here, please also email me at chiu@physics.utexas.edu. For the posting, the inclusion of your name is not required. On the other hand, the inclusion of your name together with your email address may allow me to further communicate with you. -- C. Chiu

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Present board:

question 23.3.1: the proposed aswer is wrong. the small ball could also be positively charged: Assume it is neutral, then it is attracted by a polarization effect. Now take away a single electron. This will add an infinitessimal repulsive force but the total force will still be attractive (the dipole force due to the polarization is stronger). Thus, you cannot tell the charge of the small ball. In the near-field the dipole force might be stronger than the monopole force. Robert Helling (helling@atdotde.de)

Wed Mar 5 11:33:57 CST 2003

29.6-2, what is the answer?

Tue Mar 4 17:47:48 CST 2003

Tue Mar 4 16:44:46 CST 2003

Tue Mar 4 16:44:45 CST 2003

Tue Mar 4 16:44:45 CST 2003

Tue Mar 4 16:44:44 CST 2003

Tue Mar 4 16:44:43 CST 2003

Tue Mar 4 16:44:42 CST 2003

Tue Mar 4 16:44:41 CST 2003

Tue Mar 4 16:44:40 CST 2003

Tue Mar 4 16:44:39 CST 2003

Tue Mar 4 16:44:24 CST 2003

IQ 28.3.4 - It seems that the answer given for loop equation of CDBC is backwards (signs reversed). For Instance, why does segment CD = +i5R5 when the current through R5 is going from C to D. Wouldn't this equal -i5R5? thanks, kurt hegemony@mail.utexas.edu

Tue Mar 4 09:16:05 CST 2003

23-4-2 does not say that we need to consider the field at point P. It confused me

Mon Feb 10 02:19:04 CST 2003

I think the IQ questions are swell. My only concern is that the

Mon Feb 11 04:33:41 CST 2002

on 24.3.5, the explanation of the Extra is truncated.

Sun May 14 19:27:03 CDT 2000

All the chapters now have printer-friendly lists of questions. Please send mail to scott@cs.utexas.edu if you encounter formatting errors. Thanks. -Scott Stebleton

Tue Apr 18 16:31:59 CDT 2000

I added a printer-friendly listing of the Chapter 38 questions. -Scott Stebleton

Tue Apr 18 15:09:10 CDT 2000

Fixed figures on 36.2.1. -Scott Stebleton

Fri Apr 14 14:24:51 CDT 2000

Posted a printer-friendly listing of all Chapter 37 IQ questions. -Scott Stebleton

Thu Apr 13 13:43:41 CDT 2000

Fixed 'ray-traching' typo in 36.2.1 extra. Also put a printer-friendly listing of all Chapter 36 questions on the IQ Library page. -Scott Stebleton

Wed Apr 12 11:46:36 CDT 2000

Printer-friendly listing of all Chapter 35 questions has been added to the IQ Library. -Scott Stebleton

Mon Apr 10 11:43:38 CDT 2000

The link to question 29.2.3 has been fixed. The extra for 34.7.1 has been corrected. -Scott Stebleton

Thu Apr 6 11:43:07 CDT 2000

Scott, Hi for some reason the message was terminated prior to the end. Let me resend it again. Please fix the table of content of 29.2.3 in the homepage of the iq-library. The link should be to 29.2.3.jpq not to 29.2.3.gif. Also for 34.7.1: the answer for the extra should be 5x10**14 Hz not 5x10**12 Hz. Thank you for your attention. -- C. Chiu

Wed Apr 5 15:57:09 CDT 2000

Scott, Please fix the table of content of 29.2.3 in the homepage of the iq-library. The link should be to 29.2.3.jpq not to 29.2.3.gif. Also for 34.7.1: the answer for the

Wed Apr 5 15:54:39 CDT 2000

A printer-friendly listing of all IQ questions for Chapter 34 has been added to the IQ questions page. -Scott Stebleton

Wed Apr 5 11:34:39 CDT 2000

We're not studying Chapter 33, so there aren't any IQ questions for it. Chapter 34 is the next one we study after Chapter 32. -Scott Stebleton

Mon Apr 3 11:34:16 CDT 2000

What happened to the Chapter 33 IQ-questions?? Thanks. Alvin Leung

Fri Mar 31 14:58:17 CST 2000

The following questions have been added to the IQ library: 32.6.5, 24.5.4, 34.4.5. -S. Stebleton

Thu Mar 30 20:27:01 CST 2000

The following IQ questions have been updated: 26.2.3 (update on explanation), 26.2.4 (4 distinct choices), 28.3.2 (update on explanation), 29.2.3 (4 distinct choices), 31.4.1 (minor editing), 34.7.1 (correction to the solution of the extra. -S. Stebleton

Thu Mar 30 20:26:16 CST 2000

Testing the board. 3/27/00. 2pm. C Chiu

Mon Mar 27 14:29:43 CST 2000

Mon Feb 28 11:36:08 CST 2000

For question 28.2.2, the letter 'B' is missing on the diagram describing the explanation. Thanks.

Sat Feb 26 13:27:35 CST 2000

testing

Fri Feb 11 16:46:28 CST 2000

Tue Nov 9 01:16:45 CST 1999

The figures are bad on at least half of the problems. Look at 26.2.4 as an example of a figure. The text is displaced from the line drawings, etc. As another point in this problem, there are a duplication of answers which are identical. regards, Moore

Wed Sep 15 14:54:32 CDT 1999