Recent content by Mr.4

I do believe in God although I don't recognize him as an omnipotent being. Personally my belief God is that force/law/necessity which maintains the balance between karma and effect. God is why it cannot happen any other way. Therefore I believe that an omnipotent being is ridiculous.

I was talking about the thin sheet there.

Because the electrons repel each other and the charge distribution acquires minimum potential energy by spreading uniformly over the surface..

In that case the answer I'm getting is exactly same as your first answer. So I think that is indeed correct. PS: I solved using the potential method wherein I calculated potential at any point on the z-axis and then differentiated it and put -ve sign.

Oops sorry I made a 'slight' mistake in the calculation. I've some doubts: In what direction is the hemisphere oriented? Besides the mistake I made in my previous answer I also assumed that the hemisphere had its circular face lying on the XZ plane. That is the say that its axis of symmetry was...

I tried the question under the assumption that you're only looking for the z component of the field and here's my answer: <equation removed> I just plain integrated it dividing it into small half rings if infinitesmal width.

Duh, that's what i was saying in my previous posts. I'm referring some Indian textbooks namely HC verma and Nootan ISC physics (+2). I agree with Gokul's statement but then what does the far have to do with anything if the K.E, P.E distribution is modified.

Of course I'm aware of the conservation of energy (and hence the question!). But do the math. I've referred multiple textbooks and they all suggest that when the magnitude of the leaving velocity will be greater anyhow. But back to my original question: Where does this energy come from? From...

@cesiumfrog what if the electron is approaching symmetrically from infinity. There would be a point midway between the plates where potential is zero. And are you sure that a considerably large apparatus would move?! And no the first component is not decreased. The motion in the electric field...

I was explaining the construction of Thomson's apparatus for determination of specific charge for an exam today and suddenly something popped up: Consider 2 oppositely charged plates held using insulated handles (They're not connected to a battery). If an electron moving with a velocity v...

It can be done. I've seen it in an ad of Chevrolet :D. If a weight is suspended inside the wheel as 'Integral' suggested and if the final state that after rolling up has a lower net energy than the wheel with weight in the first state then it would move up ti minimize its energy.

Yes but that's how a capacitor works. It can only be charged up to a particular point for a particular voltage.

Hey n/0 can't be taken as infinite in math, or can it?! In physics problems most of the time n/0 would mean infinity but a lot less in math.

Then the answer would be given by differentiating the equation with respect to z and put a negative sign, i.e: E = -dV/dz . Thus, answer is -30 V/m

Whenever a charge moves in a magnetic field it experiences a force mutually perpendicular to direction of motion and the magnetic field. A change in flux associated with a condcutor is equivalent to relative motion of the conductor. Dude to this motion the free electrons in the conductor starts...