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  1. When 10¹⁹elecrons are removed from a neutral metal plate through some process,
  2. A bullet loses 1/20 of its velocity after penetrating a plank.How many planks
  3. In R-L-C series circuit, the potential differences across each element is 20 V.
  4. Two spherical nuclei have mass numbers 216 and 64 with their radii R₁ and R₂,
  5. Charge q is uniformly spread on a thin ring of radius R. The ring rotates