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JEE Main 20203 SeptemberEvening Shift
Exam
JEE Main
Year
2020
Date
3 September
Shift
Evening Shift
Subject
Physics
Chapter
Magnetic Properties of Matter

JEE Main 2020 · 3 September · Evening Shift · Physics · Magnetic Properties of Matter

A perfectly diamagnetic sphere has a small spherical cavity at its...

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→\overset{\to}{B}. Then the field inside the paramagnetic substance is:

A perfectly diamagnetic sphere has a small spherical cavity at its centre, which is filled with a paramagnetic

Options

  1. AB→\overset{\to}{B}
  2. BZero
  3. Cmuch large than ∣B→∣\left|\overset{\to}{B}\right| and parallel to B→\overset{\to}{B}
  4. Dmuch large than ∣B→∣\left|\overset{\to}{B}\right| but opposite to B→\overset{\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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