Recent content by Dr. Who

The correct option is supposed to be (B). Can someone please explain why changing the resistance of the variable resistor affects the voltage across the other resistor? Also explain why (B) is the correct option? Thanks

Hi All, I have a little query concerning the derivation of PV γ = constant. In my textbook of Physics, first they give the equation for adiabatic process using the first law of Thermodynamics, as; dEint = W → (1) where, ΔEint ⇒ change in internal energy and W ⇒ workdone Then, they used...

Hi Peter, No words of mine can be enough to adequately thank you for the detailed explanation you wrote. Here, accept the Nobel prize for Physics for your services as a mentor to the budding Physicists of tomorrow!

First of all, many thanks for undoing many knots in my mind. It's wonderful the way you people deal with newbies (I know my questions would be a real nuisance for you). Alright. Now consider a capacitor powered toy car. Here no biological or chemical reactions are taking place to run the car...

Okay. My instructor also said that if I am running then my mass would also increase. How is that? My body is utilizing the chemical energy stored within my body to convert it into Kinetic energy. No external energy is provided, so how come the mass is not conserved? Can you please cite this...

Hi, My Modern Physics lecturer is of the opinion that the energy dissipated during exothermic reactions is due to infinitesimally small change in mass of the reactants. Similarly, he said that an infinitesimally small part of the food we eat gets converted into the energy using which we perform...

Hi Micro, I'm taking B.Sc. from UoK, Physics major. I hope to learn more about my subject through this forum and contribute what little I can, to the scientific community here.

I'm an undergraduate student at University of Karachi, Pakistan. I don't make bombs unless you count the "Reality Bomb" as real!

Homework Statement Please refer to the image; problem-1. My theory is that there are two spheres 'A' and 'B', where 'A' is (partially and primarily) positively charged, and 'B' is (partially and primarily) negatively charged. The magnitude of negative charge is greater than the positive charge...

Question:- A bead slides without friction around a loop-the-loop (Please click on the below link for diagram). The bead is released from a height h = 3.50R. (a) What is its speed at point A? (b) How large is the normal force on it if its mass is 5.00 g...