Recent content by athrun200

The type of op amp I am using is Voltage-to-Current Amp. Under DC voltage input, it works perfectly well, boosting the current of a signal generator (DC mode) up to 250mA with the help of single supply working at 25V. However, when I turn the signal generator in AC mode, hoping to achieve...

Yes, I have a white light laser. Thanks so much, it's so informative. In fact, my Prof restricts me to use 2 prisms only, no grating is allowed. I will give it a try tomorrow in the lab!

That means even if the original light source is a laser, it will become a plain white light after 2 prisms?

I am doing a final year project, my Prof gave me 2 prism. He wants me to do so: A white laser is shot on a prism producing a visible light spectrum, use another prism to converge the spectrum back into a laser. For me, it is theoretically impossible and I tried to convince him that it...

I don't know where to put this post, I am sorry if I put it into the wrong place. I was writing a proof on wave in conductor in blogger. But I discovered that blogger automatically break lines after a latex math. Here's my post...

Thanks. I fixed the confusion of the coordinates For the infinite plate, I can deduce the direction of induced electric field by using right hand rule. But I have some problem in finding induced electric field by using mathematical method. I used this equation to find the induced electric...

Homework Statement The problem I would like to ask is in Griffiths Introduction to Electrodynamics p358 problem 8.6 part (c)Homework Equations The Attempt at a Solution The answer is $${\varepsilon _0}EBAd\hat y$$ which is same as part (a) Here's how I found a loophole:One key information that...

Oh! Now I get it, thanks a lot!

I know --+ -+ produces total moment - {\mu _0} But how does it affect the answer?

Homework Statement Consider a system consists of two subsystem A and A' in which A contains 3 spins and A' contains 2 spins. Suppose that, when the systems A and A' are initially separated from each other, measurements show the total magnetic moment of A to be - 3{\mu _0} and the total...

Thanks a lot!

##\int_S \overleftrightarrow{T} \cdot d\vec{a}## is the momentum transferred to the surface per unit time So \overset\leftrightarrow T is the momentum transferred to the surface per unit time, per unit area, thus it is the answer? The momentum per unit area, per unit time perpendicular to xy...

Homework Statement In fact it is problem 8.5 in Griffiths 3rd ed p357 Consider an infinite parallel plate capacitor with the lower plate carrying the charger density - \sigma , and the upper plate carrying the charge density + \sigma . (a) Determine all nine elements of the stress...

I know \overrightarrow A decreases in the order of \frac{1}{r}. However how does \overrightarrow H decreases with ##r##? Base on the equation \overrightarrow H = \frac{1}{{{\mu _0}}}\overrightarrow B + \overrightarrow M , we conclude that \overrightarrow H depends on \overrightarrow B ...

I used Gauss law on the second integral, now I need to prove either \vec{A}\times \vec{H}=0 or \int \vec{A}\times \vec{H} da=0 I still cannot think of a exact method. One idea in my mind now (but not sure if it makes sense) is to use the given condition "the integral carried out over all...