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Electrical machines miscellaneous

Electrical Machines

  1. A dielectric slab with 500 mm × 500 mm crosssection is 0.4 m long. The slab is subjected to a uniform electric field of E = 6ax + 8ay kV/mm. The relative permittivity of the dielectric material is equal to 2. The value of constant ε0 is 8.85 × 10– 12 F/m. The energy stored in the dielectric in Joules is
    1. 8.85 × 10– 11
    2. 8.85 × 10– 5
    3. 88.5
    4. 885
Correct Option: B

E =1 ∈ E2 × Av

=
1
× 8.85 × 10-12 × 102 × 1012 × 0.5 × 0.5 × 0.4 = 88.57
2



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