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Calculate the force acting between two small magnets, placed in end on position 0 . 1   m apart from their centres. Given magnetic moment of each magnets is 5   Am 2

Options

  1. A0 . 6   N
  2. B0 . 8   N
  3. C0 . 15   N
  4. D0 . 2   N

Correct answer

C. 0 . 15   N

Step-by-step solution

According to Question Two small bar magnet is r = 0 . 1   m apart from their centre Magnetic moment = M 1 = M 2 = 5   Am 2 Now The relation of force F and magnetic moment M in two small bar magnet F = μ 0 4 π · 6 M 1 M 2  r  4 Put the all known values in the above relation F = 1 0 - 7 × 6 × 5 × 5 0.1 4 F = 0.15 N

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