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Calculate the energy stored per unit volume in a dielectric medium due to polarisation when P = 9 units and E = 8 units.

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Calculate the energy stored per unit volume in a dielectric medium due to polarisation when P = 9 units and E = 8 units.

(a) 1.77

(b) 2.25

(c) 36

(d) 144

I got this question in unit test.

This intriguing question originated from Polarization in division Electric Fields in Material Space of Electromagnetic Theory

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Right answer is (c) 36

The explanation: The energy stored per unit volume in a dielectric medium is given by, W = 0.5 X PE = 0.5 X 9 X 8 = 36 units.

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