Consider an infinitely long, hollow cylindrical wire. The wire has outer diameter b and the cylindrical hole at its center has diameter a.
Find the magnetic field everywhere if a known current i flows from left to right and the current is uniformly spread over the region between a and b.
Find the force that this wire would exert on a thin, straight length of wire W located a distance 2b from the axis of the cylinder if that thin wire had a current 3i

What is the frequency of a light wave with a wavelength of 620nm

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

What is the angular momentum of the bar about the axle?