Recent content by lar49

OK so using amperes law I get B=μI/2πr Is this right? And what's the relationship between electric field and potential difference?

Homework Statement # Two long, concentric, conducting cylinders of radii and b (a<b) each carry a current I in opposite directions and maintain a potential difference V. An electron with velocity u (parallel to the cylinders) travels undeviated through the space between the two cylinders...