Recent content by FishStik

Correct. Ampere's Law can only be applied when B•dl is constant along the entire loop. It can be used for situations such as an infinitely long wire or solenoid because symmetry ensures that B is constant. There is no such symmetry in a single loop, so that's why Ampere's law isn't useful in...

Ampère's law only applies in magnetostatics. That is, \vec{B}\cdot d\vec{l} must be constant for all d\vec{l} in the loop. Is that the case for your ampèrian loop?

In your Ampere's Law attempt, what is the loop you are using to determine the line integral? How did you arrive at 2\pi R in the third line?

Magnetic field inside infinitely conductive hollow tube Homework Statement There exists a thin-walled hollow aluminum tube (assume σ=∞) of radius 10 cm centered around the z-axis. A long wire with 5 mm radius has a total current 2 mA in the z-direction and is centered initially at x=-5cm as...

Thin-Film Interference: Coating a Lens -- Answers found, explanation needed! Homework Statement Boxed answers are the correct ones. Homework Equations 2L=(m+1/2)(λ/n) for constructive interference (maximum reflection, bright film) 2L=(m)(λ/n) for destructive interference (minimum...