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NEST2019PhysicsElectromagnetic Induction

A short solenoid (length L and radius r , with n turns per unit length) lies well inside and on the axis of a very long, coaxial solenoid (radius R and N turns per unit length, with R r ). Current I flows in the short solenoid. Choose the correct statement.

Options

  1. AFlux through outer solenoid due to current I in the inner solenoid is proportional to the ratio R / r .
  2. BIf instead the current I were to flow in the outer solenoid, then the flux due to it through the inner solenoi
  3. CMutual inductance of the solenoids is ₀ r^2 n N L^2 / R .
  4. DMutual inductance of the solenoids is _o r^2 n N L .

Correct answer

D. Mutual inductance of the solenoids is _o r^2 n N L .

Step-by-step solution

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