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Unformatted text preview: pherical object with free charges
Spherical object is polarized when a charged
rod is brought near it
Negative charges are depleted by grounding Spherical object is isolated from ground Spherical object is left positively charged
January 22, 2014 Physics 104, Spring 2014 15 Force on charges: Coulomb’s Law
• Coulomb’s law gives quantitative description of
the electrical force between charged particles
• Unit of charge is called a Coulomb
• Gives the magnitude and the direction of the
force between charges q1 and q2 separated by a
• Magnitude: q1 q2 k = 9x109 Nm2/C2
r • direction: along the line joining the charges
• Like charges repel, unlike charges attract January 22, 2014 Physics 104, Spring 2014 16 Example
Force on electron in Hydrogen atom
Qp=1.6x10-19 C + F Qe = -1.6x10-19 C - r = 1x10-10 m F = (9x109)(1.6x10-19)(1.6x10-19)/(10-10)2 N
= 2.3x10-8 N (to the left)
January 22, 2014 Physics 104, Spring 2014 17 Once you know the force….
• Laws of mechanics (recall 103) describe the subsequent
motion of charged...
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This note was uploaded on 02/14/2014 for the course PHYSICS 103 taught by Professor Citrinini during the Spring '09 term at University of Wisconsin.
- Spring '09