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Magnetics question

2019 · 12 Apr · Shift 1 · Q64
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Magnetics question

2019 · 12 Apr · Shift 1 · Q64

JEE MainPhysicsMagneticsMCQ+4 / −1
A thin ring of 10 cm radius carries a uniformly distributed charge. The ring rotates at a constant angular speed of 40 π\piπ rad s–1 about its axis, perpendicular to its plane. If the magnetic field at its centre is 3.8 × 10–9 T, then the charge carried by the ring is close to (μ\muμ 0 = 4 π\piπ × 10–7 N/A2 ).
  1. A
    7 × 10–6 C
  2. B
    4 × 10–5 C
  3. C
    2 × 10–6 C
  4. D
    3 × 10–5 C
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