Ampres law is often written contourintegral B vector (r vector) middot dl vector = mu_0I_enclosed. The integral on the left is

(A) the integral throughout the chosen volume.
(B) the surface integral over the open surface.
(C) the surface integral over the closed surface bounded by the loop.
(D) the line integral along the closed loop.
(E) the line integral from start to finish.

(C) line integral along a closed loop

This integral is evaluated by dividing the path into infinitesimal segments dL, calculating the scalar product B•dL for each segment, and sum these products. The component of B parallel to dL at each point is always used in evaluating this integral.

The line integral is equal to mu_o × I.

Explanation:

it about 600 mph from what i calculated

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true