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  1. A wire of one metre length carries a constant current. The wire is bent to form
  2. Two charges of equal magnitude q are placed in air at a distance 2a
  3. A long solenoid has 500 turns. When a current of 2 ampere is passed through it
  4. Two charged spheres seperated at a distance d exert a force F on each other.
  5. If the ratio of amplitude of two superposed waves is 2:1, then the ratio of maximum