Hi,all, problem is:(adsbygoogle = window.adsbygoogle || []).push({});

in Electromagnetism, we introduced a scalar potential psi, such that:

E = - grad Psi

and In newton's law, there is also a scar potential U, such that:

F= -grad U

My question is, one is the gradient of a scalar field give a field and a force???!!

Can anyone help me with understanding this? That would be great, and many thanks in advance!

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# Scalar potential in EM and Newton's Law

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