- #1
saintv
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Homework Statement
Three positive particles of charges +7.0 uC are located at the corners of an equilateral triangle of side 20 cm. Calculate the magnitude and direction of the net force on each particle.
Answer: 19.0 N [AWAY FROM THE CENTRE]
Homework Equations
F = (kQ1Q2)/(r^2)
Where:
k is the Electrostatics Constant - 9 x 10^9 Nm^2/C^2
Q1 and Q2 are the charges in (C)
r is the separation in (m)
F is the Electrostatics Force in (N)
The Attempt at a Solution
Er, so I calculated the force on one of them from another, see below:
F = (kQ1Q2)/(r^2)
= [(9 x 10^9 Nm^2/C^2)(7.0 X 10^-6 C)(7.0 X 10^-6 C)]/(.20m)^2
= 11.0 N
And that's where I'm stuck: I have absolutely no idea how I would even obtain a number close to 19.0 N!
What I do understand is the direction: by [AWAY FROM THE CENTRE] they mean that because they are all positive charges, they will all repel away from one another- right? Do correct me if I'm wrong.
I really do appreciate it!