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Question 20182
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Magnetism: Magnetic Field on Axis of Loop MCQ

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Magnetic Field on Axis of LoopEasyQuestion 20182

Question

Magnetic field on the axis of a circular loop of radius R at distance x from centre is:
  1. A
    μ₀IR²/2(R²+x²)^(3/2)
    Correct
  2. B
    μ₀I/2R
  3. C
    μ₀IR/2x²
  4. D
    μ₀Ix/2R²

Correct answer

μ₀IR²/2(R²+x²)^(3/2)

Explanation

From Biot-Savart integration: B = μ₀IR²/[2(R²+x²)^(3/2)]. At x=0 this reduces to μ₀I/(2R).

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