Recent content by saubhik

I held the view that the undergraduate physics course at CMI as the best undergraduate physics course in India as the entrance exam is competitive and tough. Very few are selected. But after reading the article: http://www.cmi.ac.in/~anirbit/CMI_Physics.pdf I feel disheartened since getting to...

Thanks for your answers. I think I have got my answer.

Thanks for your answer. Doesn't any collision between slower molecules of hotter gas and faster molecules of cooler gas occur? This seems non-intuitive. How does entropy solve this? I am not getting a "physical picture".

you mean that in some cases there will be no change in velocities of either particles. (i.e. v1=v1' and v2=v2'), it will be as though no collision has taken place. This condition also comes from energy and momentum conservation principles. In other cases we will have v2'>v1'. for the case when...

suppose you keep a hot body and a relatively cool body in direct contact and take the two bodies as a system. Particles (molecules or ions or atoms) in the hot body have higher energy and thus displays vigorous motion. The particles of the cold body had lower energy and thus their motion is less...

why does heat flows from a high temperature body to a low temperature body? The above statement can be concluded from applying conservation of momentum to particles of a system containing a high and low temperature bodies. But in texts, its written that the above statement is a consequence of...

Thanks for that! What book do you recommend for problems?

Hi all, i've been searching for a great problem books in physics. Right now, I've been solving I.E. Irodov's Problems in general physics, Mir Publishers. Some of the problems are great. Its fun solving it. I want to know, if there are many more such problem books, requiring great skill at...

The title says it all, but I am going to introduce myself first. Right now, I am pursuing (and enjoying) Bachelor's degree course in Mechanical Engineering from Jadavpur University, Kolkata, India. It has just been a little more than 2.5 months since I joined college. I have been dreaming to...

If a current does pass through a curve C (we are dealing with magnetostatics so no question of any change in electric fields) then it must also penetrate through surface S. But my problem is: what if a current does not pass through C but penetrates S? Clearly there's a B-field at all points on...

Homework Statement In Ampere's Law, we consider an amperian loop (suppose a curve C), and any surface with boundary C can be chosen. 1.If the circulation of B is zero along the curve. Does this directly imply B=0 at points on the curve C? 2.Also in some cases there may be surfaces with...

If you apply Kirchhoff's voltage law to primary of the transformer, you get the back emf equal to supply voltage. (neglecting resistance in primary circuit)

yah... that's right. So the equations don't hold for t=0? is that the DC transcience? what then happens exactly at t=0; how to express this mathematically?

1.d)biot and savart is for current distributions; why use that? Go on with the lorentz force law. Vectorially add the magnetic forces and equate to (qv)X(B_net). You'll get 3 equations each along x,y and z directions. Solve them and get your field B. regarding 2, what is the centre of a...

Homework Statement Suppose we have a circuit with the inductor, uncharged capacitor, ideal battery with emf E all in series. At t=0, the circuit is switched on. The following takes place sequentially: 1. Current at t=0 is max. Battery charges capacitor, current decreases. 2. inductor...