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  1. The work done in rotating a magnetic of magnetic moment 2 A-m² in
  2. A wire of length 1 m is moving at a speed of 2 ms⁻¹ perpendicular to its length
  3. The material suitable for making electromagnets should have
  4. The rate of increase of thermo-e.m.f. with temperature at the neutral temperature
  5. The potential energy of particle in a force field is U = A/r² – b/r, where A and B