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Electrical energy $U _0$ is stored in a charged parallel plate capacitor. On increasing the distance between the plates of a capacitor, double to initial distance the electrical energy will be :

• A
  $U _0$
• B
  $\frac{U_0}{2}$
• ✓
  $2 U _0$
• D
  $\frac{ U _6}{4}$