Solve this:
17. The field intensity of two points on the axial line of a bar magnet at distances 40c, and 20cm is 10:125. The length of the magnet is
(1) 10 cm (2) 5 cm (3) 15 cm (4) 20 cm
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Please refer to the link below for an answer to a query similar to Q17.
https://www.meritnation.com/ask-answer/question/the-values-of-magnetic-induction-at-two-points-on-the-axis-o/magnetism-and-matter/10907563
Kindly post separate questions in each post so that our experts can answer the question effectively.