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NEET 1992 (AIPMT) · Magnetic Field of Straight Wires

Magnetic Field of Straight Wires question from NEET 1992 (AIPMT)

Q74NEET 1992 · AIPMTEasy

Magnetic Field of Straight Wires

The magnetic field at a distance rr from a long wire carrying current ii is 0.40.4 tesla. The magnetic field at a distance 2r2r is

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Answer: (a)

  1. B=μ0i2πr⇒B∝1rB = \frac{\mu_0 i}{2\pi r} \Rightarrow B \propto \frac{1}{r}
  2. B′=0.42=0.2 TB' = \frac{0.4}{2} = 0.2\text{ T}
  3. So the answer is (a) 0.20.2 tesla.
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