↵Two infinitely long wires carry currents in opposite direction. Then the field at a point P which is lying midway between hem is
  • a Twice the field due to each of the wires
  • b Half of the field due to each wire alone
  • c Square of the field due to each wire alone
  • d Zero

Dear Student,

From right hand thumb rule you can deduce, that at point P field due to one wire goes into the page while due to the other wire it comes out of the page. Besides as its the midpoint and assuming current is equal and opposite we have magnitude of field equal and opposite at P.

Thus net effective field is zero

option 4

Regards.

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