Verified Solution • 2025–26 Session moderate

QJEEM22Ph69ee: JEE Main 2022 Physics - Class 12 JEEM22Ph69ee Solution: The magnetic field at the centre of a circular coil of radius…

The magnetic field at the centre of a circular coil of radius r, due to current I flowing through it, is B. The magnetic field at a point along the axis at a distance r2 from the centre is :

Multiple Choice Options

  • A B/2
  • B 2B
  • C (25)3B
  • D (23)3B

Step-by-Step Verified Solution

B=μ0I2r

Ba=μ0Ir22(r2+r24)

⇒BaB=(25)3

⇒Ba=(25)3B

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