Recent content by Felpudio

Homework Statement The potential difference Δϕ between the plates of a spherical capacitor is kept constant. Show that then the electric field at the surface of the inner sphere will be a minimum if a=(1/2)b, find that minimum. Where: a=radius of the inner sphere, b=radius of the outside...

[Mentor's note: This question was originally posted and responded to in a non-homework forum, therefore it does not have the usual homework template.] Hey, don't know how to solve this: In an inertial frame S, consider a light ray on the XY plane forming a 60 degree angle with the x-axis...

Hey, I read that if a four-vector is 'four-orthogonal' to a time-like four vector then it must be space-like. I showed this quite easily. I also read that a space-like vector can be orthogonal to another space-like vector, but can't seem to prove it. I wondered if someone could help me.