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.

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  1. 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

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

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  3. 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?

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

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