JEE PYQ: Magnetism And Matter Question 6
Question 6 - 2020 (03 Sep 2020 Shift 2)
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 $\vec{B}$. Then the field inside the paramagnetic substance is:
(1) $\vec{B}$
(2) zero
(3) much large than $|\vec{B}|$ and parallel to $\vec{B}$
(4) much large than $|\vec{B}|$ but opposite to $\vec{B}$
Show Answer
Answer: (2) zero
Solution
When magnetic field is applied to a diamagnetic substance, it produces magnetic field in opposite direction so net magnetic field inside the cavity of sphere will be zero.
BETA
