10.0 pJ of energy is stored in a 3.00 cm × 3.00 cm × 3.00 cm region of uniform electric field.
What is the electric field strength?
V = 3 cm * 3 cm * 3 cm = 27 * 10-6 m3
E = sqrt [2 U / e0 V]
= sqrt [2 * 10 * 10-12 / 8.85 * 10-12 * 27 * 10-6]
electric field strength = 289 N/C
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