Verified Solution • 2025–26 Session moderate

QJEEM19Ph3ba9: JEE Main 2019 Physics - Class 12 JEEM19Ph3ba9 Solution: A paramagnetic material has 10 28 atoms/m 3 . Its magnetic…

A paramagnetic material has 1028 atoms/m3. Its magnetic susceptibility at temperature 350 K is 2.8 ×\times 10–4. Its susceptibility at 300 K is :

Multiple Choice Options

  • A 3.726 ×\times 10–4
  • B 2.672 ×\times 10–4
  • C 3.672 ×\times 10–4
  • D 3.267 ×\times 10 −- 4

Step-by-Step Verified Solution

x α\alpha 1TC{1 \over {{T_C}}}

curie law for paramagnetic substane

x1x2{{{x_1}} \over {{x_2}}} = TC2TC1{{{T_{{C_2}}}} \over {{T_{{C_1}}}}}

2.8×10−4x2=300350{{2.8 \times {{10}^{ - 4}}} \over {{x_2}}} = {{300} \over {350}}

x2 = 2.8×350×10−4300{{2.8 \times 350 \times {{10}^{ - 4}}} \over {300}}

= 3.266 ×\times 10 −- 4

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