Recent content by universitypq98

Homework Statement We have this feedback loop, with R1=R2 and C3=C4 hebergeur d image Homework Equations I believe we should use KCL or KVL to solve the question. The Attempt at a Solution I didn't understand how this equation was found: I tried KCL to find a relation between V0 and V but...

good morning ehild :) Thanks a lot! wish me luck please.. my exam is in 3h (Y) :P have a nice day!

oh! yeah that's true! the charges are equals and opposite.. i understood it correctly now! :P haha thanks a lot! you have to be a teacher :) have a nice week-end in advanced! :)

mmmm... but i don't see if i use V=kq/d,how to arrive to one of the 4 answers proposed.. :/ let's try to do it by elimination b,c are related to the equation i have above which is not applicable here cause y isn't always >> d d surely not.. so a by elimination ! :P haha my mind going to blow...

why x is not >> d here? in fact i think in this exercice and by the figure i have drawn y=x y can be anywhere on the y axix,so y is >>d no? did i misunterstood something?

i think i have found it! :D narrow minded me.. tonight.. because tired.. mixing the formulas.. the true formula is : C= 2pii*eps0*L/ln(b/a) then q=c*v and then E=q/eps0*A(gauss law)! and i got the last choice 14.4kV/m! Just one more thing.. can anyone track me if it is correct?? you gave me...

the potential at some distance from a point charge is : V=k*q/d... :S Ok I'm lost :/

Homework Statement It's me again.. I solved this question but i want to be sure about it,so what do you think about my solution bellow? a dipole consists of a positive charge q at x=d/2 and a negative charge -q at x=-d/2 (d is the distance between the charges). What is the potential produced...

will it be =0?? cause in the inner radius no charges? this is gauss law : E=q/epsilom0*A :S i tried the calculation no answer fits mine.. so i thought it might be 0 because it is in the inner radius? Sorry if it seems that i am so narrow minded.. i have been studying physics since this...

capacitance cylinder Homework Statement Hey guys! :) I have an exam tomorrow i am a stuck with this question while reviewing :S.. Can anyone help me please? consider a cylinder capacitor of length 1m , inner radius 0.1cm and outter radius 0.2cm. You connect the capacitor to a 10V...