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Most Important Selected Qs for JEE AdvancedPhysicsMagnetic Effects of Current

Two concentric coil of radii r₁ and r₂ (r₁ r₂ ) carry currents i₁ and i₂ respectively. If the smaller coil is rotated slightly about one of its diameter it starts oscillating. Then choose the correct statements.

Options

  1. AThe oscillations are simple harmonic in nature
  2. BThe frequency of oscillation is proportional to product i ₁ i ₂ .
  3. CThe frequency of oscillation is proportional to square root of r₂
  4. DThe frequency of oscillation is independent of radius r₁ .

Correct answer

D. The frequency of oscillation is independent of radius r₁ .

Step-by-step solution

aligned & =M B & - & f i _ i r ₂ aligned

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