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  1. When a spring is extended by 2 cm energy stored is 100 J. When extended further by 2 cm
  2. In a circuit, the current lags behind the voltage by a phase difference of π/2.
  3. A plane polarised light is incident normally on a tourmaline plate. Its E vector make
  4. The order of radius of the nucleus of an atom is
  5. The wavelength of light emitted from second orbit to first orbit in a hydrogen atom is