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  1. A resistance of 20 ohm is connected to a source of an alternating potential V
  2. A rod of weight W is supported by two parallel knife edge A and B
  3. The half-life of a radioactive substance is 30 min. The time (in minutes) taken
  4. Two waves of same amplitude superpose. The resultant intensity is I₁
  5. A wire elongates by l mm when a load W is hanged from it. If the wire goes over