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  1. Electromagnets are made of soft iron because soft iron has
  2. On heating a ferromagnetic substance above curie temperature
  3. A circuit contains an ammeter, a battery of 30 V and a resistance 40.8 ohm
  4. The wavelength of Kα line in copper is 1.5Å. The ionisation energy of K electron in copper is
  5. There is a ring of radius r having linear charge densityλ and rotating with a uniform