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Q.

The ratio of magnetic fields on the axial line of a long magnet at distances of 10cm and 20cm is 12.5:1. The length of the magnet is

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a

5cm

b

10cm

c

10m

d

15m

answer is B.

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Detailed Solution

$B_{axial} = \frac{μ_{0}}{4 π} \frac{2 M d}{{(d^{2} - l^{2})}^{2}}$

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