A current of 1.2 A is flowing in a coaxial cable whose outer radius is five times its inner radius. What is the magnetic field energy stored in a 3.0- m length of the cable?

I do not know how to find the work in 3(c) since I don't know the force. Help please.

The force exerted by an electric charge at the origin on a charged particle at the point (x, y, z) with position Kr = (x, y, z) is F(F) = where K is constant. vector 7= 3' 171³ Assume K = 30. Find the work done as the particle moves along a straight line from (3,0,0) to (3,4,2).

A canoe has a velocity of 0.320 m/s southeast relative to the earth. The canoe is on a river that is flowing at 0.650 m/s east relative to the earth. (Figure 1) Part A Find the magnitude of the velocity UCR of the canoe relative to the river. Express your answer in meters per second. ▸ View Available Hint(s) ΜΕ ΑΣΦ ? VCR = Submit Part B Complete previous part(s) m/s