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Question: Answered & Verified by Expert
A magnetic field intensity at the centre of a circular wire of radius $0.1 \mathrm{~m}$ carrying a current $0.2 \mathrm{~A}$ is
PhysicsMagnetic Effects of CurrentAP EAMCETAP EAMCET 2023 (15 May Shift 1)
Options:
  • A $2 \pi \times 10^{-5} \mathrm{~T}$
  • B $\pi \times 10^{-7} \mathrm{~T}$
  • C $10^{-7} \mathrm{~T}$
  • D $4 \pi \times 10^{-7} \mathrm{~T}$
Solution:
1416 Upvotes Verified Answer
The correct answer is: $4 \pi \times 10^{-7} \mathrm{~T}$
Magnetic field intensity at the centre of a circular wire $B=\frac{\mu_0 i}{2 r}=\frac{4 \pi \times 10^{-7} \times 0.2}{2 \times 0.1}=4 \pi \times 10^{-7} \mathrm{~T}$

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