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  1. When the angle of incidence is 60° on the surface of a glass slab, it is found
  2. A circuit contains an ammeter, a battery of 30 V and a resistance 40.8 ohm
  3. If the alternating current I=I₁ cos⁡ωt+I₂ sin⁡ωt, then the rms current is given by
  4. A point charge q is situated at a distance r on axis from one end of a thin
  5. An astronomical telescope arranged for normal adjustment has a magnification of 6.