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  1. The body of mass m hangs at one end of a string of length l, the other end of which
  2. A 50Hz AC signal is applied in a circuit of inductance of (1/π)H and resistance 2100Ω
  3. From a disc of radius R, a concentric circular portion of radius r is cut-out so
  4. In circular coil, when number of turns is doubled and resistance becomes 1/4th
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