The ratio of magnetic fields due to a ba...

The ratio of magnetic fields due to a bar magnet at the two axial points `P_(1) and P_(2)` which are separated from each other by 10 cm is 25 :2 . Point `P_(1)` is situated at 10 cm from the centre of the magnet. Magnetic length of the bar magnet is (Points `P_(1) and P_(2)` are on the same side of magnet and distance of `P_(2)` from the centre is greater than distance of `P_(1)` from the centre of magnet)

A

5 cm

B

10 cm

C

15 cm

D

20 cm

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The correct Answer is:

B

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