A 2.60-cm-diameter parallel-plate capacitor with a spacing of 0.900mm is charged to 500V. What is the total energy stored in the electric field?
a) 1.44 × 10(-5) J
b) 2.88 × 10(-5) J
c) 5.76 × 10(-5) J
d) 7.20 × 10(-5) J