The distance of two points on the axis of a magnet from its center is 10 cm and 20 cm respectively. The ratio of magnetic intensity at these points is 12.5:1. The length of the magnet will be

Options :
  1. 5 cm
  2. 25 cm
  3. 10 cm
  4. 20 cm


Answer and Explanation :-

Answer: Option 3

Explanation:

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