Physics
posted by David D. on .
Two 10 cm diameter charged rings face each other, 20 cm apart. The left ring is charged to 20 nC and the right ring is charged to +20 nC.
What is the force on a 1.2 nC charge placed at the midpoint?
I have already calculated the electric field between the two rings to be 25723.87 N/C to the left. However, I don't know how to use the rings as point charges to solve the second problem.

You say you know the field. It should be along the axis of the rings. Just multiply it by the charge to get the force

Thank you. I didn't know I could do that, but it did give me the right answer.

A 6.2 "kilo" bag of sugar is on a counter. How much work is required to put the bag on a shelf a distance of 0.41 m above the counter?

how did you get 25723.87? can you show the complete calculation please?