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  1. The radius of curvature of the convex face of a plano-convex lens is 12 cm
  2. A solid which is transparent to visible light and whose conductivity increases
  3. Four cells, each of emf E and internal resistance r, are connected in series across
  4. An object is 8 cm high. It is desired to form a real image 4 cm high at 60 cm from
  5. In a primary coil 5 A current is flowing on 220 V. In the secondary coil 2200 V