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Q.

Two long thin, parallel conductors carrying equal currents in the same direction are fixed parallel to the x-axis, one passing through y=a and the other through y = -a. The resultant magnetic field due to the two conductors at any point is B. Which of the following are CORRECT ?

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a

B=0  for all points on the x-axis

b

At all points on the y-axis, excluding the origin. B has only a z-component

c

At all points on the z-axis, excluding the origin. B has only a y-component

d

B cannot have an x-component at any point in space

answer is A, B, C, D.

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Detailed Solution

On x-axis two conductors produce equal and opposite fields. So net field becomes zero

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Two long thin, parallel conductors carrying equal currents in the same direction are fixed parallel to the x-axis, one passing through y=a and the other through y = -a. The resultant magnetic field due to the two conductors at any point is B. Which of the following are CORRECT ?