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March 2nd, 2017, 08:58 PM   #1
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What if gravity acted like magnetism?

I was recently reading a topic about: What if gravity acted like magnetism?

While I was studying about it, I come across the information which makes me little blunt about basic information.

My questions arise when I read "If you have a positive charge the first thing it does is repeal all the other positive charges around it and attract all the negative charges."

I this happens because of magnetism and the electric force? Is that true that they tend to cancel themselves out? And if its true than what is the reason behind it?
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March 3rd, 2017, 05:17 AM   #2
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Gravitational fields behave a lot like the electric fields and some of the maths is strikingly similar for both of those. It behaves nothing like magnetism however.

As for this:

Quote:
Originally Posted by JamSmith View Post
My questions arise when I read "If you have a positive charge the first thing it does is repeal all the other positive charges around it and attract all the negative charges."

I this happens because of magnetism and the electric force?
Electrostatic forces.

Quote:
Is that true that they tend to cancel themselves out? And if its true than what is the reason behind it?
Not quite... magnetic fields and electric fields interact with each other, but it's not a straight "cancelling out". The equations that describe the interactions are Maxwell's equations. The behaviour written above is about a system in equilibrium perturbed by the instantaneous addition/presence of a positive charge and those attractions and repulsions are due to electrostatic force. It's a description of the classic "stick a balloon to a wall" trick with static electricity, except with a positive test charge instead of a negative one.
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