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  1. An air core solenoid has 1000 turns and is one meter long. Its cross sectional area
  2. Which one of the following statements is true, if half-life of a radioactive substance
  3. If the rise in height of capillary of two tubes is 6.6 cm and 2.2 cm
  4. The current through an inductor changes from 3 A to 2 A is 1 m/s. If induced e.m.f.
  5. Equal charge q each are placed at the vertices AQ and B of an equilateral triangle