Recent content by Steve F

Ah I see it now. I was taking A to be the area of cross-section of the artery...but of course the field can't be parallel to the blood flow. Thanks for your help

But A isn't dependent on t, so dA/dt doesn't make sense. Sorry if I'm being stupid!

Thanks for the reply, but i still don't follow how he gets E = BLv

1. The question... "Blood is a conducting fluid. When flowing through an artery of diameter 10mm which is subject to a constant magnetic field of strength 60mT, an e.m.f. of 0.3mV appears across the width of the artery. Calculate the speed of the blood" 3. The solution... The solution given...

I understand what you are saying berkeman, I just wasn't convinced by their description of the lamp INCREASING to a steady glow. When it says the lamp increases to a steady glow...do you think this means that it increases in so far as all lamps increase to a steady glow when switched on? Steve

There it is. I understand the actual questions. I don't get their description of the intensity of the lamp just. Steve

Hi thanks for the replies. As I am new to this I am only seeing them now, sorry about that! Anyway, my understanding too was that the bulb would decrease in brightness. It would need to be connected to an inductor in series to increase in brightness. I will try to find the question and take a...

Trying to figure out why an inductor in parallel with a lamp and battery will cause the lamp to GRADUALLY increase in brightness to a steady glow. I understand the concept of a coil of wire, producing a changing magnetic field when the current running through it changes then the changing...