We were asked to compute for the electric field experience by a point charge P caused by a ring-shaped conductor. And my professor just used Q for the computation. However, when we computed for the electric field experienced by P caused by a charged rod, we used the lambda to derive the charge. Shouldn't the ring problem be computed the same way also?

Question

anonymous · Answer

|dw:1343466065669:dw|lambda is linear charge density....in a ring of radius R  AND CENTRE O, consider a small element dl on A and B ON the ring..