Recent content by ascii

Homework Statement There is a circuit formed by a capacitor and a resistor with an AC source of 212V. It is known that the currentr that goes through the circuit is 0.5A, with a phase angle of pi/8 rad in relationship with the tension and that the power consumed by the circuit is 50W. What...

Ok. But no, that's wrong. You have to take the absolute value of the charge, so both currents will add. At least that's what Sears and Semansky say.

Homework Statement Through a fluorescent tube of a diameter of 3cm cross the transversal secion per second 2x10^18 electrons and 0.5x10^18 positive ions (with charge +e) What is the current that goes through the tube? Homework Equations I=Vd*n*e*A The Attempt at a Solution I have...

Did I do something wrong here not to get any answer?

Homework Statement Two solenoids on the same cylindrical axis Solenoid A has 400 loops and a current of 3,5 amp. Produces a flux of 300microWb on itself and 90 microWb on solenoid B Solenoid B has 700 loopsHomework Equations Calculate the energy stored in the system.The Attempt at a Solution...

Alright I get it now, it's not considered in the integral because you do it over the transversal area of the coil.

Then I don't understand what is that other part of the forum for :confused: Anyway... Ampere's law says that the integral of a magnetic field around a closed loop equals mu zero times the current penetrating a random surface attached to that loop. What you wrote there is Faraday's law. But that...

Alright, thanks. Now something else. My book multiplies the time variation of the magnetic flux with the number of loops, and says that value negative is what equals to the induced EMF. I wonder, isn't the number of loops already considered in the flux integral?

Yeah I was trying that myself but there were some problems with the database, so I just wrote what I wanted to say, with words. I don't know if you want me to be more detailed now or that post was before you saw my edit.

I have a problem with the concept here. Does it mean that the flux of a magnetic field is function of a field which is function of a current which by itself is function of that flux?