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  1. A cell of emf E and internal resistance r supplies current for the same time
  2. A proton of mass m and charge q is moving in a plane with kinetic energy E. If there exists
  3. The angular momentum of an electron is J. The magnitude of the magnetic moment
  4. The angle between the vectors (i+j) and (j+k) is
  5. Masses of three wires of copper are in the ratio of 1:3:5 and their lengths