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  1. A proton is moving in a uniform magnetic field B in a circular path of radius a
  2. The electric field part of an electromagnetic wave in a medium is represented by
  3. A spring balance is attched to the ceiling of lift.A man hangs his bag on the string
  4. The angle of a prism is A. One of its refracting surfaces is silvered
  5. The de-Broglie wavelength of neutron in thermal equilibrium at temperature T is