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  1. Four identical cells of emf Ԑ and internal resistance r are to be connected in series.
  2. A battery having e.m.f. 4 volt and internal resistance 0.5 Ω is connected
  3. In the relation n=PV/RT, n stands for
  4. The speed of an electron having a wavelength of 10⁻¹⁰ m is
  5. Two beams of light having intensities I and 4I interfere to produce a fringe pattern