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  1. The direction of magnetic line of force of a bar magnet is
  2. Two concentric spheres kept in air have radii R and r.
  3. For photoelectric emission from certain metal the cut-off frequency is v
  4. Two bodies of mass 1 kg and 3 kg have positive vectors i + 2j + k and -3i -2j + k
  5. The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain