Lecture02 - Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

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

Unformatted text preview: Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 2 Slide 1 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ PHYSICS 272 Electric & Magnetic Interactions Lecture 2 Superposition Principle & Electric Dipoles [EMI 14.4-14.8] Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 2 Slide 2 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Re-Cap Last time Course elements: lecture, recitation, lab, WebAssign Coulombs law for electric force Point charges and unit of charge [electron: e; proton: +e; nucleus: + Z e] Electric force electric field Announcement 1. Lab this week will be Python Tutorial CHANGE: BEMA Survey/Test no longer offered this semester (see revised course syllabus) 2. Help Center Schedule now posted on web (under Syllabus). Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 2 Slide 3 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ A penny carrying a small amount of positive charge Q p exerts an electric force F on a nickel carrying a large amount of positive charge Q n that is a distance d away (Q n > Q p ). Which one of the following is not true? A. The electric force exerted on the penny by the nickel is also equal to F . B. The number of electrons in the penny is less than the number of protons in the penny. C. , if d is small compared to the size of the coins. D. , if d is large compared to the size of the coins. Question 1 (Chap. 14) 2 4 1 ~ d Q Q F p n 2 4 1 ~ d Q Q F p n iClicker Frequency Code: CD Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 2 Slide 4 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ Which one of the following is not true? The electric force exerted by an electron on an electron: A. decreases by a factor of 25 if the distance is increased by a factor of 5. B. has the same magnitude as the electric force exerted by a proton on a proton at the same distance. C. has the same direction as the electric force exerted by a proton on a proton at the same distance. D. is much weaker than the gravitational force between them. Question 2 (Chap. 14) Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu ) Prof. Michael Manfra ( mmanfra@purdue.edu ) Lecture 2 Slide 5 PHYS 272: Matter and Interactions II -- Electric And Magnetic Interactions http://www.physics.purdue.edu/academic_programs/courses/phys272/ The Coulomb Force F 1 4 Q 1 Q 2 r 2 r 0 = permittivity constant 2 2 1 4 1 r Q Q F F...
View Full Document

Page1 / 28

Lecture02 - Fall 2010 Prof. Yong Chen ( yongchen@purdue.edu...

This preview shows document pages 1 - 6. Sign up to view the full document.

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