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Magnetic Properties of Matter question

2006 · Shift 0 · Q89
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Magnetic Properties of Matter question

2006 · Shift 0 · Q89

JEE MainPhysicsMagnetic Properties of MatterMCQ+4 / −1
Needles N1{N_1}N1​, N2{N_2}N2​ and N3{N_3}N3​ are made of ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet when brought close to them will
  1. A
    attract N1{N_1}N1​ and N2{N_2}N2​ strongly but repel N3{N_3}N3​
  2. B
    attract N1{N_1}N1​ strongly, N2{N_2}N2​ weakly and repel N3{N_3}N3​ weakly
  3. C
    attract N1{N_1}N1​ strongly, but repel N2{N_2}N2​ and N3{N_3}N3​ weakly
  4. D
    attract all three of them
View written solutionFree

Correct answer: B

  1. Identify the magnetic behavior of each material

    • N1N_1N1​ is ferromagnetic
    • N2N_2N2​ is paramagnetic
    • N3N_3N3​ is diamagnetic

  2. Recall how substances respond to an external magnet

    • Ferromagnetic substances are strongly attracted by a magnet.
    • Paramagnetic substances are weakly attracted by a magnet.
    • Diamagnetic substances are weakly repelled by a magnet.

  3. Apply this to the three needles

    • For N1N_1N1​ (ferromagnetic): it will be attracted strongly.
    • For N2N_2N2​ (paramagnetic): it will be attracted weakly.
    • For N3N_3N3​ (diamagnetic): it will be repelled weakly.

  4. Match with the given options

    • A: says N3N_3N3​ is repelled, but does not mention weak repulsion and says N2N_2N2​ is strongly attracted — incorrect.
    • B: says N1N_1N1​ strongly attracted, N2N_2N2​ weakly attracted, N3N_3N3​ weakly repelled — correct.
    • C: says N2N_2N2​ is repelled — incorrect.
    • D: says all are attracted — incorrect.

  5. Final answer

    The correct option is: B\boxed{\text{B}}B​

  6. Comparison with stored correct answer

    Stored correct answer: B\text{B}B

    My derived answer also is B\text{B}B, so they agree.

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