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GATE XE 2025 | Question: 46

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​​​​$B$ is the magnetic flux density and $T_{c}$ is the critical temperature. The Meissner effect is represented by

  1. $\mathrm{B}=0$ at $\mathrm{T} \leq \mathrm{T}_{\mathrm{c}}$
  2. $\mathrm{B}=0$ at $\mathrm{T}>\mathrm{T}_{\mathrm{c}}$
  3. $\mathrm{B} \neq 0$ at $\mathrm{T} \leq \mathrm{T}_{\mathrm{c}}$
  4. $\nabla \mathrm{B}=0$ at $\mathrm{T}=\mathrm{T}_{\mathrm{c}}$

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