question_answer 29)

  Consider the two idealized systems : (i) a parallel plate capacitor with large plates and small separation and (ii) a long solenoid of length L >> R, radius of cross-section. In (i)  is ideally treated as a constant between plates and zero outside. In (ii) magnetic field is constant inside the solenoid and zero outside. These idealised assumptions, however, contradict fundamental laws as below : case (i) contradicts Gauss's law for electro- static fields case (ii) contradicts Gauss's law for magnetic fields. case (i) agrees with case (ii) contradicts

Answer:

  (b)According to Gauss's law for electrostatic field, It does not contradict for electrostatic fields as the electric field lines do not form a continuous closed path. According to Gauss's law in magnetic field, It contradicts for magnetic, field because there is a magnetic field inside the solenoid and no field outside the solenoid carrying current but the magnetic field lines form the closed paths.