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QJEEM20Phb348: JEE Main 2020 Physics - Class 12 JEEM20Phb348 Solution: A perfectly diamagnetic sphere has a small spherical cavity at…

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→\overrightarrow B . Then the field inside the paramagnetic substance is : JEE Main 2020 (Online) 3rd September Evening Slot Physics - Magnetic Properties of Matter Question 42 English

Multiple Choice Options

  • A B→\overrightarrow B
  • B zero
  • C much large than ∣B→∣\left| {\overrightarrow B } \right| and parallel to B→\overrightarrow B
  • D much large than ∣B→∣\left| {\overrightarrow B } \right| but opposite to B→\overrightarrow B

Step-by-Step Verified Solution

A perfect diamagnetic substance will completely expel the magnetic field. Therefore, there will be no magnetic field inside the cavity of sphere. Hence the paramagnetic substance kept inside the cavity will experience no force.

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