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NEET 2024
Exam
NEET
Year
2024
Subject
Physics
Chapter
Magnetic Effects of Current

NEET 2024 · Physics · Magnetic Effects of Current

A tightly wound 100 turns coil of radius 10 cm carries a current of...

A tightly wound 100 turns coil of radius 10 cm carries a current of 7 A . The magnitude of the magnetic field at the centre of the coil is (Take permeability of free space as 4π×10−74 \pi \times 10^{-7} SI units):

Options

  1. A4.4 T
  2. B4.4 mT
  3. C44 T
  4. D44 mT

Correct answer

B. 4.4 mT

Step-by-step solution

The magnitude of magnetic field due to circular coil of NN turns is given by BC=μ0iN2R=4π×10−7×7×1002×0.1=4.4×10−3 T=4.4mT\begin{aligned} & B_C=\frac{\mu_0 i N}{2 R} \\ & =\frac{4 \pi \times 10^{-7} \times 7 \times 100}{2 \times 0.1} \\ & =4.4 \times 10^{-3} \mathrm{~T} \\ & =4.4 \mathrm{mT} \end{aligned}
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