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  1. Two concentric coils each of radius equal to 2π cm are placed at right angles
  2. Two bulbs 40 watt and 60 watt and rated voltage 240 V are connected in series
  3. A current of 5 A is flowing at 220 V in the primary coil of a transformer. If the voltage
  4. A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV.
  5. If a solid ball of metal has a concentric spherical cavity with in it if the ball