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A long straight solenoid has n turns per unit length. An alternating current I = Imsinωt flows through it. Find the displacement current density as a function of distance r from the solenoid axis. The cross-sectional radius of solenoid equals R
  • a)
  • b)
  • c)
  • d)
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A long straight solenoid hasnturns per unit length. An alternating cur...
Magnetic field  

To find electric field inside the solenoid, consider a closed loop C, of radius r.
Flux of magnetic field


From Faraday Law,

  is negative, so,  lies opposite to the orientation.

Displacement current density,

Displacement current through a circle of radius r.

The correct answer is:  
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A long straight solenoid hasnturns per unit length. An alternating currentI=Imsinωtflows through it. Find the displacement current density as a function of distancerfrom the solenoid axis. The cross-sectional radius of solenoid equalsR.a)b)c)d)Correct answer is option 'C'. Can you explain this answer?
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