Which of the following material is repelled by a magnet?

Which of the following material is repelled by a magnet?
| Which of the following material is repelled by a magnet?

A. Iron

B. Aluminum

C. Nickel

D. Gold

Please scroll down to see the correct answer and solution guide.

Right Answer is: D

SOLUTION

CONCEPT:

  • Magnetic materials: The materials that can be either attracted or repelled when placed in an external magnetic field and can be magnetized themselves are called magnetic materials.
    • For examples: Iron, nickel, cobalt, etc
Diamagnetic Substance Paramagnetic substances Ferromagnetic substances
Diamagnetic substances are those which develop feeble magnetization in the opposite direction of the magnetizing field. Paramagnetic substances are those which develop feeble magnetization in the direction of the magnetizing field. Ferromagnetic substances are those which develop strong magnetization in the direction of the magnetizing field.
Such substances are feebly repelled by magnets and tend to move from stronger to weaker parts of a magnetic field. Such substances are feebly attracted by magnets and tend to move from weaker to stronger parts of a magnetic field. They are strongly attracted by a magnet and tend to move from weaker to the stronger part of a magnetic field.
Magnetic susceptibility is small and negative i.e. -1 ≤  χ ≤ 0. Magnetic susceptibility is small and positive i.e.  χ > 0 Magnetic susceptibility is very large and positive i.e. χ > 1000
Examples: Bismuth, copper, lead, zinc, gold, etc. Example: Manganese, aluminum, chromium, platinum, etc. Example: Iron, cobalt, nickel, gadolinium, and alloys like alnico

EXPLANATION:

  1. Since iron is a Ferromagnetic material that is strongly attracted by magnets. So option 1 is not correct.
  2. Aluminum​ is a Paramagnetic material that is attracted by magnets. So option 2 is not correct.
  3. Nickel is a Ferromagnetic material that is strongly attracted by a magnet. So option 3 is not correct.
  4. Gold is a diametric material, so it is repelled by magnets. Hence option 4 is correct.

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