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  1. A circular disc of radius R is removed from a bigger circular disc of radius 2R
  2. To get three images of single object, one should have two plane mirrors at an angle of
  3. The net electric force on a charge of +3μC at the mid-point on the line joining two
  4. In an a.c circuit the e.m.f. (e) and the current (i) at any instant are given
  5. The mass of a lift is 2000kg. When the tension in the supporting cable is 28000N, then its acceleration is