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MCQEasyJEE 2023Types of Magnetic Materials

JEE Physics 2023 Question with Solution

Given below are two statements:

Statement I: For diamagnetic substance, −1≤X<0-1 \leq X < 0, where XX is the magnetic susceptibility.

Statement II: Diamagnetic substances when placed in an external magnetic field, tend to move from stronger to weaker part of the field.

In the light of the above statements, choose the correct answer from the options given below.

  • A

    Both Statement I and Statement II are false

  • B

    Statement I is incorrect but Statement II is true

  • C

    Both Statement I and Statement II are true

  • D

    Statement I is correct but Statement II is false

Answer

Correct answer:A

Step-by-step solution

Standard Method

Given: Two statements about diamagnetic substances are to be checked.

Find: Which option correctly identifies the truth values of Statement I and Statement II.

From the provided solution:

  • Statement I is correct because for diamagnetic substances, magnetic susceptibility XX is negative and lies in the range −1≤X<0-1 \leq X < 0.
  • Statement II is correct because diamagnetic substances move from the stronger part of an external magnetic field to the weaker part of the field.

Therefore, both statements are true.

The solution concludes that the correct option is A, even though the answer key points to option (3). Since the solution is the primary source here, the correct option is A.

Common mistakes

  • Assuming that diamagnetic susceptibility is positive. This is wrong because diamagnetic substances always have negative magnetic susceptibility. Use the sign of XX correctly before judging Statement I.

  • Confusing diamagnetic substances with paramagnetic substances. This is wrong because diamagnetic materials move toward weaker magnetic field regions, whereas paramagnetic materials tend to move toward stronger regions. Identify the material type first.

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