p240_ct2_w12_jan_10 - Physics 240 Winter 2012 Lecture #2 My...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Physics 240 Winter 2012 Lecture #2 Dr. Dave Winn 2405 Randall Lab winn@umich.edu My Office Hours (1416 Randall Lab) Monday 1pm-3pm Tuesday 1pm-3pm Thursday 2pm-4pm (Prof. Gidley)
Background image of page 1

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

View Full DocumentRight Arrow Icon
Gravitational Field 2 ˆ e e GM m r R g mg Which of the following represents the gravitational field near the surface of the Earth? A) B) C)
Background image of page 2
Two point charges and a point P lie at the vertices of an equilateral triangle as shown. Both point charges have the same magnitude q but opposite signs. There is nothing at point P . The net electric field that Charges #1 and #2 produce at point P is in Q21.6 Charge #1 Charge #2 q + q x y P A. the + x -direction. B. the – x -direction. C. the + y -direction. D. the –y- direction. E. none of the above
Background image of page 3

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

View Full DocumentRight Arrow Icon
Q21.9 A. the + x -direction. B. the – x -direction. C. the + y -direction. D. the –y- direction. E. none of the above Positive charge is uniformly distributed around a semicircle. The electric field that this charge produces at the center of curvature P is in
Background image of page 4
Science Learning Center (SLC) Join a peer-Led Study Group for PHYSICS 240 Small group of 8 motivated students studying together Two hour weekly meetings, located in an SLC alcove or central campus classroom Review material, solve problems, discuss concepts, ask questions, and prepare for exams Led by trained facilitator who has taken the class successfully, who will guide and encourage group discussions Registration opens for PHYSICS 240: 4 pm Wednesday, January 11th online at: www.lsa.umich.edu/slc 8 groups offered for PHYSICS 240 Groups begin meeting: Sunday, January 16th Email questions to: slcstudygroups@umich.edu
Background image of page 5

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

View Full DocumentRight Arrow Icon
Quantifying the forces between charges • Experiments (which can be difficult) reveal: – | F | 1/r 2 – | F |Q 1 | * |Q 2 | • Summarized as Coulomb‟s law • Constant k relates units of charge and force k = 8.99x10 9 Nm 2 /C 2 k = 1/(4  0 ) 0 = 8.85x10 -12 C 2 /Nm 2 • A „central force‟ • Forces from many charges from linear superposition Now tested by experiments with exquisite precision
Background image of page 6
“Spooky action- at-a-distance”: Einstein • Two charges interact across empty space according to Coulomb‟s law: F=(kQ 1 Q 2 /r 12 2 ) – How does Q 1 „know‟ that Q 2 is there?
Background image of page 7

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

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 31

p240_ct2_w12_jan_10 - Physics 240 Winter 2012 Lecture #2 My...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online