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Unformatted text preview: for the charges, the product Q1Q2
is negative and the force is attractive Hydrogen Atom Example
• The electrical force between the electron and proton is
found from Coulomb s Law
– Fe = keq1q2 / r2 = 8.2 x 10-8 N
• This can be compared to the gravitational force between
the electron and the proton
– Fg = Gmemp / r2 = 3.6 x 10-47 N Conceptual Example 21-1: Which charge exerts the greater
Two positive point charges, Q1 = 50 μC and Q2 = 1 μC, are separated
by a distance . Which is larger in magnitude, the force that Q1 exerts
on Q2 or the force that Q2 exerts on Q1? Fe = ke Q1 Q2
r 2 -4.0 μC Q3
Q1 Q2 Electric Field – Test Particle
• The electric field is defined in terms of a test particle, q
• By convention, the test particle is always a positive
• The test particle is used to detect the existence of the
• It is also used to evaluate the strength of the field
– The test charge is assumed to be small enough not to
disturb the charge distribution responsible for the field We could also define a test mass m0 and use
this to measure...
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This document was uploaded on 02/21/2014 for the course CHEM 110A 110a at UCLA.
- Winter '13