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JEE Main20203 Sep 2020Evening ShiftPhysicsMagnetic Properties of MatterActual

A perfectly diamagnetic sphere has a small spherical cavity at its centre, which is filled with a paramagnetic substance. The whole system is placed in a uniform magnetic field B → . Then the field inside the paramagnetic substance is:

Options

  1. AB →
  2. BZero
  3. Cmuch large than B → and parallel to B →
  4. Dmuch large than B → but opposite to B →

Correct answer

B. Zero

Step-by-step solution

When magnetic field is applied diamagnetic substance produces magnetic field in opposite direction so net magnetic field will be zero.

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