Question

Four long, parallel conductors carry equal currents of I. The figure is an end view of the conductors. Crosses are INTO 2) the page and dots are OUT of the page. Calculate the magnitude and direction of the magnetic field at the center of the square with sides of length a. 3) A rectangular conducting loop (with very very long length) of resistance R, mass m and width w falls (gravity is constant) into a uniform magnetic field (B) as shown in the figure. Explain why the loop will eventually reach a terminal speed (constant speed). Find an expression for the terminal speed in the current flow in the loop (cw or ccw) terms of the givens. Which way will re a Determine the magnitude of the magnetic field at a point P located a distance a from the corner of an in 4) bent at a right angle as shown in the figure. The wire carries a steady current I. Note: this wire is NOT long and straight. Use the Biot law. You will have an integral. You DO NOT need to solve the integral. But you need to set it up (including limits) so you could solve it. Everything needs to be in terms of a common variable and the givens (a and I) and of course constants.

Answer 1

2.This problem is from topic magnetic effects of current.

We will use result for magnetic field due to long current carrying wire.

Dala go。