Electric charges and field

Problems

Solution. The spherical charged conductor has surface density

Question4. A charge is distributed uniformly over a ring of radius ‘a’. Obtain an expression for the electric intensity ‘E’ at a point on the axis of the ring. Hence show that for the points at a large distance from the ring, it behaves like a point charge.

Solution. Suppose that the ring is placed with its plane perpendicular to the x-axis. Consider a small element dl of the ring.

As the total charge q is uniformly distributed, the charge dq on the element dl is

Question5. A thin semicircular ring of radius ‘a’ is charged uniformly and the charge per unit length is ‘λ’. Find the electric field at its center.

Originally published at https://bdslearningapp.blogspot.com on October 20, 2020.

I am a teacher so i want to introduce better teaching, learning and understanding method which must be innovative and succinct to students and their parents for