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Two 10-cm-diameter charged rings face each other, 20 cm apart. The left ring is charged to...

Two 10-cm-diameter charged rings face each other, 20 cm apart. The left ring is charged to − 30 nC and the right ring is charged to + 30 nC.

a) What is the magnitude of the electric field E⃗  at the midpoint between the two rings?

b) What is the magnitude of the force on a proton at the midpoint?

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