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Electric Force & Coulomb's Law Guide

The document discusses Coulomb's Law for calculating electric force between two charges, compares electric force to gravitational force, and applies the superposition principle to find net electric force on a charge. It also provides examples of using Coulomb's Law to calculate electric force between two charges and the force pushing apart two spheres resulting from nuclear fission.

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101 views7 pages

Electric Force & Coulomb's Law Guide

The document discusses Coulomb's Law for calculating electric force between two charges, compares electric force to gravitational force, and applies the superposition principle to find net electric force on a charge. It also provides examples of using Coulomb's Law to calculate electric force between two charges and the force pushing apart two spheres resulting from nuclear fission.

Uploaded by

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Objectives:

• Calculate electric force using Coulomb’s Law.

• Compare electric force with gravitational force.

• Apply the superposition principle to find the resultant


force on a charge and to find the position at which the
net charge is zero.
Coulomb’s Law: Electric Force

F = k(q q )
e 1 2
2
r
9 2
k = Coulomb constant = 8.99x10 Nm or
C2
q1 = charge of charge 1 (C)
q2 = charge of charge 2 (C)
r = distance between charge 1 & charge 2 (m)
Comparison of forces

Gravitational (Fg) Electric (Fe)

Fg = G m1m2 Fe = k q1q2
r2 r2
G = gravitational constant = 6.67x10-11 Nm2/kg2
k = Coulomb’s constant = 8.99x109 Nm2/C2
Practice Problem
1. Two charges 5 C and 15 C are
separated by 10 cm. What is the
electric force between them?
2. In fission, a nucleus of uranium-238,
which contains 92 protons, divides into
smaller spheres, each having 46
protons and a radius of 5.9x10-15 m.
What is the magnitude of the electric
force pushing the two spheres apart?
Practice Problem
3. Figure shows three
point charges that
lie in the x-y plane in
a vacuum. Find the
magnitude and
direction of the net
electrostatic force
on q1.
Practice Problem
4. In Bohr’s model of the hydrogen atom,
the electron is in a circular orbit about the
nuclear proton at a radius of 5.29x10-11
m. Determine the speed of the electron.

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