NEET Physics Biot-Savart Law MCQ Question
Using the Biot-Savart Law, calculate the magnitude of the magnetic field at a point located 0.2 m away from a current element of 0.01 m carrying a current of 5 A, at an angle of 90 degrees to the current element. (Use μ₀ = 4π × 10⁻⁷ T m/A).
5 × 10⁻⁸ T
1 × 10⁻⁸ T
4 × 10⁻⁸ T
2 × 10⁻⁸ T
Correct Answer
Detailed Explanation
Using the Biot-Savart Law formula μ₀/(4π) * (I * dl * sin θ) / r², with I = 5 A, dl = 0.01 m, r = 0.2 m, and θ = 90°, the magnetic field B = (4π × 10⁻⁷ T m/A)/(4π) * (5 A * 0.01 m * 1) / (0.2 m)² = 5 × 10⁻⁸ T.
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