Question

Two 10-cm-diameter charged rings face each other, 15 cm apart. the left ring is charged to -23 nc and the right ring is charged to +23 nc . what is the magnitude of the electric field e⃗ at the midpoint between the two rings?

Answer 1

Electric field for a single ring;
E= k Qb/(a²+b²)^3/2
For the given problem
E = 2 k Qb/(a²+b²)^3/2
But since a = b
E = (1/√2) × kQ/a^2
E = 0.707 × 9 ×10^9 × 20×10^-9/0.01
E = 12726 N/C
Therefore; the magnitude of the electric field at the midpoint between the two rings is 12726 N/C