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  1. Electrons in the atom are held to the nucleus by
  2. A beam of cathode rays is subjected to crossed Electric (E) and Magnetic fields (B)
  3. In a circuit, 5% of total current passes through a galvanometer. If resistance
  4. The excitation potential of hydrogen atom in the first excited state is
  5. A,B and C are voltmeters of resistance R, 1.5 R and 3R respectively, as shown