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  1. An electric motor operating on a 60 volt D.C supply draws a current of 10 amp.
  2. If the minimum energy of photons needed to produce photoelectrons is 3 eV,
  3. To obtain a p-type semiconductor, germanium must be doped with
  4. A body of mass m is placed on the earth’s surface. It is taken from the earth’s surface
  5. If the radioactive dacay constant of radium is 1.07 x 10⁻⁴ year⁻¹, then its half-life