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  1. A charged particle with a velocity 2×10³ ms⁻¹ passes undeflected through electric field
  2. Coherent sources are those sources for which
  3. If the wavelength of incident light falling on a photosensitive material decreases,
  4. An electron in a circular orbit of radius 0.05 nm performs 10¹⁶ rev/s. The magnetic
  5. A galvanometer of 50 Ω resistance has 25 divisions. A current of 4×10⁻⁴ A gives