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Question

An example of a perfect diamagnet is a superconductor. This implies that when a superconductor is put in a magnetic field of intensity B, the magnetic field BS inside the superconductor will be such that :
  1. BS=B
  2. BS=0
  3. BS=B
  4. BS<B but BS0

A
BS=B
B
BS=0
C
BS=B
D
BS<B but BS0
Solution
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A diamagnet has a tendency to repel the magnetic field lines passing through it.
For a perfect diamagnet or a semiconductor, the field lines wont enter the superconductor at all
Hence, the magnetic field inside the superconductor will be 0

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