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Question (1)

QN0039164

Consider the two idealised systems (i) a parallel plate capacitor with large plates and small separation and
(ii) a long solenoid of length , 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

(A)
case (i) contradicts Gauss' law for electrostatic fields
(B)
case (ii) contradicts Gauss' law for magnetic fields
(C)
case (i) agrees with .
(D)
case (ii) contradicts

Correct Answer: B

Explanation:

The electric field lines, do not form a continuous path while the magnetic field lines form the closed paths.

Gauss's law states that, for electrostatic field. So, it does not contradict for electrostatic fields as the electric field lines do not form closed continuous path.

According to Gauss' 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 path.

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Question (2)

QN0039165

A paramagnetic sample shows a net magnetisation of 8 when placed in an external magnetic field of at a temperature of . When the same sample is placed in an external magnetic field of at a temperature of , the magnetisation will be

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

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Question (1)

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Question (2)

A paramagnetic sample shows a net magnetisation of 8 when placed in an external magnetic field of at a temperature of . When the same sample is placed in an external magnetic field of at a temperature of , the magnetisation will be

Explanation:

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