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  1. What are the unit of K = 1 / (4 π ?￢ﾂﾒ)
  2. A parallel beam of fast moving electrons is incident normally on a narrow slit.
  3. The radius of the first orbit of the hydrogen atom is a₀. The radius of the second orbit
  4. A wire of one metre length carries a constant current. The wire is bent to form
  5. A proton and an alpha particle both enter a region of uniform magnetic field B,