Asked by David D.

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.
Answered by drwls
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
Answered by David D.
Thank you. I didn't know I could do that, but it did give me the right answer.
Answered by ashley
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?
Answered by hk
how did you get 25723.87? can you show the complete calculation please?
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