Recent content by JasonBourneV

um, it doesn't change in the middle?

A loop of wire is initially held above a short solenoid. A constant counterclockwise (as viewed from above) current passes through the coils of the solenoid. Suppose that the loop of wire is steadily lowered, passing over the solenoid. What is the direction of the induced current when the...

Thanks a lot, Doc Al, for the link!

oh... I think I into the table. The current is clockwise, so my fingers curl into the table. Is that right?

I did, I got counterclockwise but that wasn't the answer.

Can't this be calculated from B = mu*N*I/2*pi*r? Book explanation says that this can't be done because there is "no path through the center along which the field is constant" So I guess I must use the Biot-Savart Law. How should I go about doing that?

Inside the toroid, in which direction does the magnetic field point, if the current is going clockwise around the loop? So I tried to consider the fields due to two points on opposite sides of the toroid. Then I got stuck because I don't know what direction their fields added up. What do I do?

Can Ampère’s law be used to find the magnetic field at the center of a square loop carrying a constant current? How about at the center of a circle formed by a current-carrying conductor. In both cases, I don't think so because path must cross through center of our interest, and here it...

Can anyone explain to me what Ampere's Law really is? For example, what does the current encircled really mean? Is it the total current passing through the loop in either direction?

Okay, so flow through the larger pipe is faster. That means greatest drop in potential energy?

Thanks a lot. Now consider a variant on the circuit. The water is pumped to high pressure, but the water then faces a fork in the pipe. Two pipes lead back to the pump: large pipe L and small pipe S. Since the water can flow through either pipe, the pipes are said to be in parallel. What can...

Hey guys: Consider the following water circuit: water is continually pumped to high pressure by a pump, and then funnelled into a pipe that has lower pressure at its far end (else the water would not flow through the pipe) and back to the pump. Two such circuits are identical, except for one...