Magnetic field due to 0.1 A current flowing through a circular coil of radius 0.1 m and 1000 turns at the centre of the coil is (a) 0.2 T (b) 2 × 10⁻⁴ T (c) 6.28 × 10⁻⁴ T (d) 9.8 × 10⁻⁴ T

Answer: (c). B = (μ₀ n I)/(2r) B = 4π×10⁻⁷× 1000× 0.12× 0.1 = 2π×10⁻⁴ So the answer is (c) 6.28×10⁻⁴ T.

Magnetic field due to 0.1 A current flowing through a circular coil… | NEET 1999 (AIPMT)

Q111NEET 1999 · AIPMTEasy

Biot-Savart Law & Circular Coils

Magnetic field due to $0.1\text{ A}$ current flowing through a circular coil of radius $0.1\text{ m}$ and 1000 turns at the centre of the coil is

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Answer: (c)

$B = \frac{\mu_0 n I}{2r}$
$B = \frac{4\pi\times10^{-7}\times 1000\times 0.1}{2\times 0.1} = 2\pi\times10^{-4}$
So the answer is (c) $6.28\times10^{-4}\text{ T}$ .