Recent content by fruitbubbles

Homework Statement . A circular coil of radius 5.0 cm and resistance 0.20 Ω is placed in a uniform magnetic field perpendicular to the plane of the coil. The magnitude of the field changes with time according to B = 0.50e-20t T. What is the magnitude of the current induced in the coil at the...

Okay, I just looked at my notes and see what you mean, but I don't understand why sometimes I can just do the cross product of A x B as ABsin(theta) and sometimes I have to do all of that. I have no clue what it means

..I do not have the slightest idea as to what that is.

Homework Statement A particle (mass 2.0 mg, charge –6.0 µC) moves in the positive direction along the x-axis with a velocity of 3.0 km/s. It enters a magnetic field of (2.0i + 3.0j + 4.0k) mT. What is the acceleration of the particle? Homework Equations F = ma to find the acceleration F = qv...

So it has to go through R2? Is there reason that it can't go to the battery because since the circuit is open, there is nothing attracting the current towards the battery anymore?

Do you miss that it's discharging? and wouldn't the current from the capacitor be split up between going to through R and to the battery?

I'm honestly so confused. Does the fact that the capacitor stored charge somehow mean that there is still current left that can flow?

If it's opened, there is no more current flowing through the circuit..?

Will the voltage across the capacitor at t = 2 be the same as the voltage across R1? So I am thinking that the current I calculated was just the current for the R1 C branch. So this means if I know R1 and R2 and the current for the R1 C branch, I should be able to use KIrchhoff's Rules to find...

Homework Statement The circuit contains an ideal battery, two resistors and a capacitor (C= 250 μF).The switch is closed at time t = 0, and the voltage across the capacitor is recorded as a function of time as shown in the graph. Homework Equations time constant = RCThe Attempt at a...

I don't understand why..just setting up the equation W = PE0-PEf wouldn't just take care of the sign, since we are calculating the work. Like, why does there have to be..further thinking about it after calculating W?

Oops, my mistake. I see that now I'm getting the right power, but I'm not sure why the answer should be negative when my answer is positive. Is it because since the positive alpha particles is getting closer to two electrons (which attract the positive charges), the PE decreases?

Homework Statement Four electrons are located at the corners of a square 10.0 nm on a side, with an alpha particle at its midpoint. How much work is needed to move the alpha particle to the midpoint of one of the sides of the square? Homework Equations W = PEo-PEf PE (if several point...

huh. What a simple explanation, and it makes perfect sense. Thank you!

So this is a probability question, and I am asked to find P(0.6 < Y <= 2.2) where Y = X1 + X2 X1~U(0,1) and X2~exp(2). X1 and X2 are both independent random variables. Our professor worked it out, but I do not understand his explanation. So he starts by using the convolution:$$f_y (t) =...