question_answer

  Two wires each carrying a steady current i are shown in two different configurations in column I. The magnetic field produced due to current in the wires is described in column II. Match the situations A and B in column I with all the correct statements in column II.

Column I	Column II
A. Point P is situated midway between the wires above. B. Point P is situated at the midpoint of the line joining the centres of the circular wires, which have same radii.	(i) The magnetic fields B at P due to the current in the wire are in the same direction. (ii) The magnetic fields B at P due to the current in wires are in the opposite directions. (iii) Magnetic field at P is zero.

 

Answer:

                  (i) A matches with (ii) and (iii). Applying Fleming's Left Hand Rule, the magnetic field at P due to the current will be equal and in opposite direction. (ii) B match with only (i) in column II. Applying Fleming's Left Hand Rule, the magnetic field at P due to two currents in opposite directions will be in directions.