Linear Superposition: Electric Fields Explained

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The principle of linear superposition applies to electric fields, allowing the calculation of the resultant electric field from multiple charges. By determining the electric field contributions from each charge separately and then vectorially adding them, one can find the total electric field at a given point. This method is confirmed to be correct in the discussion. The participants express agreement on the application of this principle. Overall, the linear superposition principle is essential for analyzing electric fields from multiple sources.
Brewer
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this principle does apply to electric fields doesn't it?

If I have two (different) charges in different positions, and the question asks for the electric field (mag and direction) at another point, I can find them separately and then add them together (using vectors of course) can't I?
 
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Yes.

Regards,
George
 
Yes, you can find the electric field strength using the summation of vectors.

~H

edit: Sorry George, didn't see your reply.
 
Thanks guys.

So with any luck my answer is correct then!
 

Thread 'Magnitude of buoyant force in fluids of different densities'

The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?
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