Magnetism And Matter

When a bar magnet of magnetic moment M, is placed in a magnetic field of induction B, then net force on it is

while torque

i.e.

Maximum magnetization

Step 1: Understanding the Concept:
Superconductors exhibit the Meissner Effect, where they expel all magnetic magnetic flux from their interior when cooled below a critical temperature.
Step 2: Detailed Explanation:
For a material, . Inside a superconductor, , so . Magnetic susceptibility is defined as . $ $ This indicates that superconductors are perfectly diamagnetic.
Step 3: Final Answer:
The correct option is (d).

Step 1: Understanding the Concept:
The magnetic moment ( ) of a solenoid or coil is the product of the number of turns, the current, and the area of the loop.
Step 2: Calculation:
Formula: Given: , , . $ ^{-1}$.