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A dielectric slab with $500$ $mm$ $×$ $500$ $mm$ cross-section is $0.4$ $m$ long. The slab is subjected to a uniform electric field of $E=6a_x+8a_y$ $KV/mm$. The relative permittivity of the dielectric material is equal to $2$. The value of constant $\varepsilon _0$  is $8.85*10^{-12} F/M$ . The energy stored in the dielectric in Joules is

  1. $8.85*10^{-11}$
  2. $8.85*10^{-15}$
  3. $88.5$
  4. $885$
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