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Topic Question Set

Q 1 :    

The incorrect relation for a diamagnetic material (all the symbols carry their usual meanings and ε is a small positive number) is                       [2024]

  • μ<μ0

     

  • 0≤μr<1

     

  • -1≤χ<0

     

  • 1<μr<1+ε

     

(4)

The relative magnetic permeability of diamagnetic material is slightly less than 1. So, the option 1<μr<1+ε is incorrect. 
 

 

Q 2 :    

Match List-I with List-II.                                                    [2024]

  List-I (Material)   List-II (Susceptibility (χ))
A. Diamagnetic I. χ=0
B. Ferromagnetic II. 0>χ≥-1
C. Paramagnetic III. χ≫1
D. Non-magnetic IV. 0<χ<ε (a small positive number)

 

Choose the correct answer from the options given below:

  • A-II, B-III, C-IV, D-I

     

  • A-II, B-I, C-III, D-IV

     

  • A-III, B-II, C-I, D-IV

     

  • A-IV, B-III, C-II, D-I

     

(1)

For diamagnetic materials, magnetic susceptibility is less than zero i.e., (-1≤χ<0).

So, A→II.

For ferromagnetic materials, magnetic susceptibility is large χ≫1.

So, B→III

For paramagnetic materials, the value of magnetic susceptibility is small but positive 0<χ<ε.

So, C→IV

For non-magnetic materials, magnetic susceptibility is zero.

So, D→I

Hence, option (1) is correct

Q 3 :    

The variation of susceptibility (χ) with absolute temperature (T) for a paramagnetic material is represented as :               [2023]
 

  • [IMAGE 238]

     

  • [IMAGE 239]

     

  • [IMAGE 240]

     

  • [IMAGE 241]

     

(1)

In accordance with Curie's Law, χ∝1T

χ vs 1T graph will be straight line as shown in first graph.

Q 4 :    

The magnetic susceptibility is negative for               [2016]

  • ferromagnetic material only

     

  • paramagnetic and ferromagnetic materials

     

  • diamagnetic material only

     

  • paramagnetic material only

     

(3)

Magnetic susceptibility is negative for diamagnetic material only.