Two identical wires A and B, each of length ‘l’, carry the same current T

Two identical wires A and B, each of length ‘l’, carry the same current T. Wire A is bent into a circle of radius R and wire B is bent to form a square of side ‘n’. If BA and B 8 are  the values of  magnetic field  at the centres  of     the   circle   and   square respectively, then the ratio Ba/Bb is :

  1. π²/8
  2. π²/16√2
  3. π²/16
  4. π²/8√2
Anurag Mishra Professor Asked on 4th April 2016 in Physics.
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