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  1. Two charges placed in air repel each other by a force of 10⁻⁴ N. When oil is
  2. In an electrical circuit R,L,C and an AC voltage source are all connected in series.
  3. The wavelength of Kα line in copper is 1.5Å. The ionisation energy of K electron in copper is
  4. The de-Broglie wavelength of an electron moving with a velocity 1.5×10⁸ ms⁻¹ is equal
  5. A hollow metal sphere of radius 10 cm is charged such that the potential on its surface