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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.

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Announcements
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

Chapter 25

Electric Forces & Charges

(Coulomb’s Law)


Newton s law of gravitation revisited
Newton’s Law of Gravitation, revisited..

where

Notice:

  • Mass is always positive.

  • Gravity is alwaysattractive.

m2

r

m1


Coulomb s law
Coulomb’s Law..

where

Notice:

  • Charges can be positive or negative.

  • Force can be attractive or repulsive.

q2

r

q1


Coulomb s law r estrictions
Coulomb’s Law - restrictions

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

OK

Not OK


Quiz question 1
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
Coulomb’s Law and Superposition

  • Q: What is the ?

q1

q2

q3


Coulomb s law and superposition1
Coulomb’s Law and Superposition

  • Q: What is the ?

  • A:

q1

q2

q3


Quiz question 2
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
Prob. 25.16

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


Prob 25 37
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.