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# Announcements - PowerPoint PPT Presentation

Announcements. Homework for tomorrow… (Ch. 25, CQ 13, Probs. 12, 35 ) Office hours… MW 12:30-1:30 pm TR 9-10 am F 10-11 am Tutorial Learning Center (TLC) hours: ??. Chapter 25. Electric Forces &amp; Charges ( Coulomb’s Law ). Newton’s Law of Gravitation, revisited.

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Announcements
• Homework for tomorrow…

(Ch. 25, CQ 13, Probs. 12, 35)

• Office hours…

MW 12:30-1:30 pm

TR 9-10 am

F 10-11 am

• Tutorial Learning Center (TLC) hours:

??

### Chapter 25

Electric Forces & Charges

(Coulomb’s Law)

Newton’s Law of Gravitation, revisited..

where

Notice:

• Mass is always positive.
• Gravity is alwaysattractive.

m2

r

m1

Coulomb’s Law..

where

Notice:

• Charges can be positive or negative.
• Force can be attractive or repulsive.

q2

r

q1

Coulomb’s Law - restrictions

charges must be small compared to their separation (“point-like”)

OK

Not OK

Quiz Question 1

Two uniformly charged spheres are firmly fastened to and electrically insulated from frictionless pucks on an air table. The charge on sphere 2 is three times the charge of sphere 1.

Which force diagram correctly shows the magnitude and direction of the electrostatic forces:

Coulomb’s Law and Superposition
• Q: What is the ?

q1

q2

q3

Coulomb’s Law and Superposition
• Q: What is the ?
• A:

q1

q2

q3

Quiz Question 2

Two protons (p1 and p2) and an electron (e) lie on a straight line as shown. The direction of the net force on p1 ,p2 , and e, respectively, are:

• left, right, left
• left, right, right
• right, left,left
• right, left, right
• right, right, left

p1

p2

e

Prob. 25.16

What is the net electric force on chargeAin Figure EX25.16?

Prob. 25.37

What is the force F on the 5.0 nC charge in Figure P25.37? Give your answer as a magnitude and an angle measured cw or ccw (specify which) from the + x-axis.