Recent content by usman27

I will continue from your R = EL/JA expression. J = \sigmaE therefore, R = EL/\sigmaEA the E's cancel out and your answer should be R = L/\sigmaA Hope this helps.

RC is called time constant... ravi, what is your understanding? are you here to look for answers ONLY??

That is because the diameter is in (mm) so is the current density :)

At the time instant where two cars meet up, the distance traveled by Car B will be 45 more than Car A... v = x/t is the main equation for this type of question.

yes... always go meters for length unless otherwise specified! and yess the answer is -9.9

study kirchhoff's junction law... J = I/pi*r^2 ; pi = 3.14... Hope this helps... good luck.

I think C and F are true...

You need to apply conservation of momentum and energy. Initial conditions do not require you to resolve the velocity vector into components. You need to resolve the velocity vector into x and y components for the final condition.

For part a) Find out the current due to +ive ions and -ive ions. Add them to get total current... For part b) You already know the answer >>> +ive to -ive