Two electric dipoles with charges+Q, where Q = 3.5 mC, are arranged as shown in the Figure. The charges +Q on the left are attached to each other by a rigid rod, and the two charges on the right are also rigidly attached to each other. Find the magnitude of the electric force between the two dipoles.
Homework Answers
The total force is F = Σ kQq / d² (There will be no net vertical
force)
In horizontal direction,
F = (2*k*Q²)*([1/(7.5m)²] - [cosΘ/((7.5m)² + (1.5m)²])
where cosΘ = cos[arctan(1.5m / 7.5m)] = cos[11.3º] = 0.98, k =
8.99*10^9 N·m²/C² and Q = 3.5*10^-3 C
=> F = 213.4N
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