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Magnetics question

2021 · 26 Aug · Shift 1 · Q43
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  5. /2021 · 26 Aug · Shift 1 · Q43

Magnetics question

2021 · 26 Aug · Shift 1 · Q43

JEE MainPhysicsMagneticsMCQ+4 / −1
The fractional change in the magnetic field intensity at a distance 'r' from centre on the axis of current carrying coil of radius 'a' to the magnetic field intensity at the centre of the same coil is : (Take r < a)
  1. A
    32a2r2{3 \over 2}{{{a^2}} \over {{r^2}}}23​r2a2​
  2. B
    23a2r2{2 \over 3}{{{a^2}} \over {{r^2}}}32​r2a2​
  3. C
    23r2a2{2 \over 3}{{{r^2}} \over {{a^2}}}32​a2r2​
  4. D
    32r2a2{3 \over 2}{{{r^2}} \over {{a^2}}}23​a2r2​
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