Given E = 50 N/C, energy density is 1.1068 × 10-8 J/m3.
Use formula u = (ε0/2)E2 = (8.8541 x 10-12/2)×(50)2 = 1.1068 × 10-8 J/m3.
Note that magnetic field B = 0.
Total energy density is 1.1068 × 10-8 + 0 = 1.1068 × 10-8 J/m3.
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