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  1. A piece of iron is heated in a flame. It first comes dull red then becomes reddish
  2. A hollow sphere of charge does not produce an electric field at any
  3. Two capacitors 3μF and 4μF, are individually charged across a 6 V battery.
  4. A proton is projected with a speed of 3×10⁶ m/s horizontally from east to west.
  5. Photons of 5.5 eV energy fall on the surface of the metal emitting photoelectrons