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Magnetics question

2025 · 29 Jan · Shift 1 · Q60
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Magnetics question

2025 · 29 Jan · Shift 1 · Q60

JEE MainPhysicsMagneticsMCQ+4 / −1
Consider a long straight wire of a circular cross-section (radius a) carrying a steady current I. The current is uniformly distributed across this cross-section. The distances from the centre of the wire’s cross-section at which the magnetic field [inside the wire, outside the wire] is half of the maximum possible magnetic field, any where due to the wire, will be :
  1. A
    [a/2, 3a]
  2. B
    [a/4, 3a/2]
  3. C
    [a/2, 2a]
  4. D
    [a/4, 2a]
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