A condenser of capacity $50\,\mu F$ is charged to $10\;volts$. Its energy is equal to
  • A$2.5 \times {10^{ - 3}}\;joule$
  • B$2.5 \times {10^{ - 4}}\;joule$
  • C$5 \times {10^{ - 2}}\;joule$
  • D$1.2 \times {10^{ - 8}}\;joule$
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