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Moving Charges and Magnetism question

2022 · Q145
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Moving Charges and Magnetism question

2022 · Q145

NEETPhysicsMoving Charges and MagnetismMCQ+4 / −1

A closely packed coil having 1000 turns has an average radius of 62.8 cm. If current carried by the wire of the coil is 1 A, the value of magnetic field produced at the centre of the coil will be (permeability of free space =4π×10−7= 4\pi \times {10^{ - 7}}=4π×10−7 H/m) nearly

  1. A
    10−-−3 T
  2. B
    10−-−1 T
  3. C
    10−-−2 T
  4. D
    102 T
View written solutionFree

Correct answer: A

Magnetic field at the centre of coil

$$B = {{{\mu _0}NI} \over {2R}}$$

On substituting the given values

$$ \Rightarrow B = {{4\pi \times {{10}^{ - 7}} \times {{10}^3}} \over {2 \times 62.8 \times {{10}^{ - 2}}}}$$

$ = {10^{ - 3}}\,T$

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