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Verified answer
LISTRIK STATISQp = 36 uC
Qr = 81 uC
r = 20 cm
rr = __?
r = rp + rq = 20 cm
rp / rr = √Qr / √Qp
rp / rr = √36 / √81
rp / rr = 6 / 9
rr = 9/15 × (20 cm)
rr = 12 cm ← jwb