Recent content by cseil

Homework Statement A square coil rotates around an axis passing through the center. It is inside a magnetic field of B= 0.6T uniform and constant. The side of the coil is a = 2cm, the resistance R is 0.1 ohm. The coil is powered by a generator that gives an emf = 0.2 + 0.24sin(ωt). The current...

Yes, sorry, I meant that. Thank you!

Homework Statement A rectangular coil with a and b sides can rotate around the axis AA' with angular velocity ω. It is in a magnetic field as in figure. Calculate the flux of B when the coil is orthogonal to the axis AA'. Calculate the \epsilon_{max} and express the position of the coil...

I can't understand what does it mean, actually.

It is the angle between B and Bz!

Homework Statement A circular coil with center on the z axis and orthogonal to the xy axis carries a current. The coil is in a magnetic field B with axial symmetry compared to the x axis. B forms an angle θ with the z axis. Calculate the magnetic force acting on the coil. 2. Homework...

It is not asked there. It's my post here reported on that website, I didn't even know it existed! There's no definition on the textbook, sometimes it just refers to them.

Shouldn't I know something else? It doesn't provide me any data..

Oh, ok ## 0.04 = x(1833+1) ## x is ##2.18x10^{-5}##m. What was my mistake then?

Sorry, I forgot to say the units. 10^-13 m! The ratio of accelerations is ##\frac{a_p}{a_e} = \frac{1}{1833} ## The ratio of distance is the same, because t is the same. I don't understand how to use it, though

Homework Statement Between two plates (distant 4cm) there's an electric field (E = 100N/C). A proton starts moving from the positive plate and an electron starts moving from the negative plate. At what distance from the positive plate do they meet? (is "meet the right verb here? :biggrin:)...

That was very clear, thank you. I know that half of the energy furnished by the generator during the process of charge changes to heat, but I don't think this problem wants me to consider that.

Hello everyone, I'd like to know if my understanding of local and integral quantities is clear. An integral quantity refers to the entire physical system, it is not defined point by point. A local one is defined point by point, for example ρ(x,y,z). Can I consider the charge dq as a local...

How can I consider that last part into the energy supplied by the generator?

If I consider the current as anticlockwise I get the following equation ## -\epsilon1 - ir1 - iR - ir2 +\epsilon2 = 0 ## And the result is ok, R = 14 ohm. The drawing was unclear, so I assume that the positive terminals of the batteries were above (the opposite of the circuit that ehild draw...