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MODEL PAPER 7 — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsMODEL PAPER 71 Mark
MCQ
Consider the two idealised 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), E 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:
  • A
    case (ii) contradicts Gauss's law for magnetic fields.
  • B
    case (i) contradicts Gauss's law for electrostatic fields.
  • C
    case (ii) contradicts en $\oint H \cdot d 1=I_{e n}$
  • D
    case (i) agrees with $\oint E . d 1=0$
✓

Answer

(a) case (ii) contradicts Gauss's law for magnetic fields.
Explanation: case (ii) contradicts Gauss's law for magnetic fields.

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