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Question

The intensity of magnetic field at point X on the axis of a small magnet is equal to the field intensity
at another point y on its equatorial axis. The ratio of X and Y from the centre of the magnet will be
  1. 23
  2. 23
  3. (2)1/3
  4. 21/3


Solution

The correct option is D 21/3
If d1 is the distance of point X on axial line and d2 is distance of point Y on equatorial line, then
B1=μ04π2Md31,B2=μ04πMd32As B1=B2μ04π2Md31=μ04π2Md32d31=2d32;d1d2=21/3

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