su11EIS

# su11EIS - Exam I Solutions Part A Multiple choice questions...

This preview shows pages 1–3. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Exam I Solutions Part A: Multiple choice questions. Check the best answer. Each question carries a value of 4 points. 1. Concerning the electrostatic feld, which oF the Following is NOT true? ¡ield lines do not Form closed curves. ¡ield lines start on positive charges and end on negative charges. √ The potential energy oF a system changes sign iF all positive charges are changed to negative, and vice versa. [This would amount to changing the choice ¡ranklin made, nothing more.] Any non-zero E-feld at the surFace oF a conductor must be perpendicular to the surFace. 2. A conductor has the shape shown, and is given a net positive charge. The charge density is: UniForm throughout the volume. UniForm over the surFace only. √ On the surFace only, with greatest density around point a . On the surFace only, with smallest density around point b . [It is even smaller on the ¢at part oF the surFace.] a b Physics 54 Summer 2011 1 3. An isolated solid non-conducting sphere carries positive charge Q distributed uniformly through its volume. Taking potential to vanish at inFnite distance, V at points within the sphere: Is the same everywhere. √ Is highest at the center. Is highest at the surface. Varies inversely with radial distance from the center. 4. Identical capacitors A and B are fully charged by the same battery. Capacitor A is disconnected from the battery while capacitor B remains connected to it. Identical dielectric slabs are inserted between the plates of the capacitors. The Fnal capacitance of A is greater than that of B. [Same] The Fnal charge is the same for both capacitors. {Greater for B] √ The Fnal stored energy is greater for B. The work done by the person who inserts the slab into B is positive....
View Full Document

## This note was uploaded on 10/19/2011 for the course PHYSICS 54L taught by Professor Thomas during the Summer '09 term at Duke.

### Page1 / 7

su11EIS - Exam I Solutions Part A Multiple choice questions...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online