Recent content by solzonmars

I didn't realize it wasn't given in the figure. Theta is 15°.

Homework Statement An electron in a cathode-ray tube is accelerated through a potential difference of 10 kV, then passes through the d = 2.4-cm-wide region of uniform magnetic field in the figure. Homework Equations - Am I taking the entirely wrong approach in the solution? The Attempt at a...

@sophiecentaur I understand what you mean for a solid conducting object, but for a shell does the electric field in the centre cavity actually affect the electrons in the conductor?

Yeah, it's a conducting shell. I understand that the charge on the inner surface is -Q, which implies that the charge on the outer surface is Q. However, why would the fact that the electric field inside the conductor is 0 result in no effects on the outside—if the inner surface charge...

Ah, so it doesn't actually cancel out fully. I was intending to use a Faraday cage as an example of a charged conductor (in the Falstad stimulation I had actually used a spherical shell). Any idea why a spherical shell would cancel out the field though?

If a charge is put inside a spherical shell, why is the electric field outside the shell independent of the location of the charge? Gauss's law could find that the net flux is independent, but not each individual field? Is this something about the surface charge density being independent of...

Why does a Faraday Cage work? (or more generally, why does the inside of a conducting shell have no electric field if there are charges placed outside it?) I understand that this is the result of polarisation, but why does the polarisation happen to exactly cancel out the field? Could there be...

I think I see what you mean. So in the case where static friction is sufficient, if we pull with a force less than the maximum static friction, the tension just 'feeds off of' the static friction force, while still maintaining this zero acceleration. How about in the case where static friction...

@jbriggs444, do you mean that this system is statically indeterminate? I'm still not really sure about what the concept means. @kuruman, I agree that the constant velocity, like the sting case, is in mechanical equilibrium. It's just that there's both tension and friction in the string case...

This is a bit of a general question. Say that there's a block on a ramp, with a (massless) rope attaching it to the top of a ramp. If we're given values for the mass of the block, maximum tension, and coefficients of static and kinetic friction, how would we determine the friction or tension...