A straight section PQ of a circuit lies along the X-axis from x= −a2 to x= a2 and carries a steady current i. The magnetic field due to the section PQ at a point X = + a will be
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a
Proportional to a
b
Proportional to a2
c
Proportional to 1/a
d
Zero
answer is D.
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Detailed Solution
Magnetic field at a point on the axis of a current carrying wire is always zero.