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  1. Two lines of force due to a bar magnet
  2. The power factor of an AC circuit having resistance R and inductance L connected
  3. A linear aperture whose width is 0.02 cm is placed immediately in front of a lens
  4. Large transformers, when used for some time, become hot and are cooled by circulating
  5. Given a sample of radium-226 having half-life of 4 days. Find the probability,