L02_viet_Electric Field

# L02_viet_Electric Field - Physics 122 Electricity and...

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

Physics 122 Electricity and Magnetism Lecture 2 Electric Field

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

View Full Document
05/07/09 Physics 122 - Lecture 2 2 Motion and Response Question: If charge A moves, how long does it take for the force vector on B to respond by changing direction?
05/07/09 Physics 122 - Lecture 2 3 Isaac Newton vs. Michael Faraday Isaac Newton: Forces like gravity and electricity are examples of action at a distance . The “influence” of A reaches across space to affect B instantly and without the need for contact. Michael Faraday: Forces like gravity and electricity are mediated by a “field” that alters the space around the mass or charge. Particle A produces a field, and particle B responds to this field by experiencing a force. Changes in the field require time to propagate.

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

View Full Document
05/07/09 Physics 122 - Lecture 2 4 Example : The Gravitational Field (1) 1 2 1 on 2 2 on 1 2 m m F F G r = = 1 2 1 on 2 2 1 2 2 2 mass 1 , toward mass 1 , toward mass 1 m m F G r m m G r m g = = = r r
Physics 122 - Lecture 2 5 Example : The Gravitational Field (2) on m ˆ ˆ F mg j g g j m m - = = = - r r (1) The field strength g is proportional to the mass. g~m 1 . Larger masses create stronger gravitational fields. (2) The field strength is

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.

## This note was uploaded on 04/25/2009 for the course ECE PHYS122 taught by Professor Viet during the Spring '09 term at 東京大学.

### Page1 / 18

L02_viet_Electric Field - Physics 122 Electricity and...

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

View Full Document
Ask a homework question - tutors are online