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Two thick wires and two thin wires, all of the same materials and same length form a square in the three different ways $P$, $Q$ and $R$ as shown in fig with current connection shown, the magnetic field at the centre of the square is zero in cases

• A
  In $P$ only
• B
  In $P$ and $Q$ only
• C
  In $Q$ and $R$ only
• ✓
  $P$ and $R$ only