Recent content by n0va

so does this make sense? dL = Rdθ area of the cross sectional area with arc length dl = area = \frac{dl}{2R\pi}\piR2 = RdθR2\pi/2R\pi = R2dθ/2 so do i do that cross r? and why are we using the area in this case?

actually can i even use the biot savart law in this case? because the law is used for infinitesimal current elements only and in this case, the distance between the current element and point of interest is very small seeing that the point of interest is on the wire itself...

okay so when I find the magnetic field due to a small length dL, do i just integrate that over the course of the half circle piR or do i also include the radius? because if the wire is just a semi circle, then does the straight line segment also carry a charge?

Homework Statement Electrical current is flowing along a long, straight wire that has a shape of a half-cylinder of radius R. Cross-section of the wire is shown, current is directed out of the plane of the picture. Current is distributed uniformly along the wire and has total magnitude I. Find...

Cmon seriously?

Does my answer make any sense at all? Or am i misinterpreting it? They're asking for the E field on point A, and since the distribution starts at A, x at that point is 0 and therefore there is no electricfield at point A?

Homework Statement Thin rod AB has length L=100 cm and total charge q0=37 nC that is distributed in such a way that its line density \lambda is proportional to the square of the distance from the end A, i.e. \lambda(x) =kx^2. Determine electric field E at the end A of the rod. Homework...