Voltage rating of a parallel plate capacitor is 500 V. Its dielectric can withstand a maximum electric field of 106 V m^–1. The plate area is 10^–4 m². What is the dielectric constant if the capacitance is 15 pF? (given ?₀ = 8.86 × 10^–12 C² N^–1 m^–2)

(a) 3.8

(b) 8.5

(c) 6.2

(d) 4.5