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Moving Charges and Magnetism question

2002 · Q134
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Moving Charges and Magnetism question

2002 · Q134

NEETPhysicsMoving Charges and MagnetismMCQ+4 / −1
The magnetic field of given length of wire for single turn coil at its centre is B then its value for two turns coil for the same wire is
  1. A
    B/4
  2. B
    B/2
  3. C
    4B
  4. D
    2B
View written solutionFree

Correct answer: C

B1 = B = μ0I2R{{{\mu _0}I} \over {2R}}2Rμ0​I​

Further, B2 = μ0(2I)2r{{{\mu _0}\left( {2I} \right)} \over {2r}}2rμ0​(2I)​

Now 2 × 2π\pi πr = 2π\pi πR or r = R/2

Hence B2 = 4×μ0I2R=4B4 \times {{{\mu _0}I} \over {2R}} = 4B4×2Rμ0​I​=4B

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