NEET2016Physics-Magnetism
NEET 2016 Physics Magnetic Field due to Current MCQ Question
Type: MCQ-conceptual-Medium-Class 12
A long straight wire of radius a carries a steady current I. The current is uniformly distributed over its cross-section. The ratio of the magnetic fields B and B' at radial distances 2a and 2a respectively, from the axis of the wire is
A
1
B
4
C
1/4
D
1/2
Correct Answer
Option A
Detailed Explanation
The magnetic field inside a long straight wire is proportional to the distance from the center, and outside it is inversely proportional to the distance. At the same radial distance, the ratio is 1.
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