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Question

The magnetic poles placed in air repel each other with a force of 4×106N. When the space between them is filled with a medium the repulsive force becomes 2.24×105N. The relative permeability of the medium is


  1. 528
  2. 5.6
  3. 8.96×1011
  4. 56

A
56
B
528
C
5.6
D
8.96×1011
Solution
Verified by Toppr

F=4×106N
Fnew=2.24×105
F×M2=Fnew Here M is the permeability.
M2=2.24×1054×106
M2=5.6

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