1.

Consider the two idealized systems : (i) a parallel plate capacitor with large plates and small separation and (ii) a long solenoid of length L lt ltR, radius of cross-section. In (i) overset(to) 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 :

Answer»

case (i) contradicts Gauss's law for electrostatic fields.
case (ii) contradicts Gauss's law for magnetic fields.
case (i) agrees with `OINT OVERSET(to) (E ) . Overset(to) (d)l = 0`
case (ii) contradicts `oint overset(to) (H) .overset(to)(d) l = I_("EN")`

Solution :The electrostatic field lines do not form a continuous CLOSED path while the magnetic field lines form the closed paths.
According to the Gauss.s law `oint overset(to) (E ) .overset(to)(d)a = (q)/( in_0)` for electrostatic field. Electric field lines does not form a continuous closed path. So the law for the electric field line is unabolished.
For a magnetic field Gauss.s law is `oint overset(to)(B). overset(to)(d) s= 0`
Hence the statement given is abolished.


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