Recent content by Raihan amin

What I understand is that the β parameter of the npn transistor is temperature dependent. Increasing the temperature increases the collector current and hence the LED turns ON. But I don't understand the resistor arrangement.Also I can see that the diode is keeping the Base-Emitter junction in...

This is written on Greiner's Classical Mechanics when solving a Tautochrone problem. Firstly,I don’t understand why we didn’t use the term ##m=0## and Sencondly, how the integrand helps us to fulfill the Dirichlet conditions. That means,how do we know that the period is 1?Thanks

Now using this formula,you can find E too.

Now put these value in the Original equation,and you are done.

You can do this by using the boundary condition on ##V##,i.e, $$V(\frac{\pi}{2}) =0$$

What you have calculated is the potential difference between two coaxial cone ,where the inner one has a potential of ##V## at ##{\theta}_1## and the outer one has a potential of 0 at ##{\theta}_2##. So check your calculation again,and find the right equation which fulfill the boundary...

Yes,i am asking for that

Can you elaborate it,please ?

I wonder how a photon could have a mass.

##\frac v c =\frac 1 5## ,not so negligible,so you have to perform relativistic calculations

Homework Statement Think of a drop of radius ##R## deposited on a fibre of radius ##b(b<<L)##.Find ##{\Delta{P}}## Homework Equations The relationship between excess pressure and the surface tension is given by Yong-Laplace equation, $$\Delta{P} = \sigma{(\frac{1}{R_1}+\frac{1}{R_2})}$$ The...

Here it is

I know that way,but it is also a valid process i think. You can see page 305 of "A Guide to Physics Problems" by Cahn and Nadgorny

Homework Statement A superconducting spherical shell of radius R is placed in a uniform magnetic field ##\vec{B_0}## 1)Find the magnetic field everywhere outside the shell 2)the sutface current density Homework Equations Inside the shell the net magnetic field is 0, and at the surface also...

And i have no idea about the shape of the bubble when the cylinder starts rotating. Please give the actual answers of your questions .