Practice Crystal Structure - CSIR-UGC NET Offered by Unacademy

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Crystal Structure

Quick practice

Question 1 of 4

A flux quantum (fluxoid) is approximately equal to $2 \times 10^{-7}$ gauss $-\mathrm{cm}^{2}$ . A type II superconductor is placed in a small magnetic field, which is then slowly increased till the field starts penetrating the superconductor. The strength of the field at this point is $\frac{2}{\pi} \times 10^{5}$ gauss.

The applied field is further increased till superconductivity is completely destroyed. The strength of the field is now $\frac{8}{\pi} \times 10^{5}$ gauss. The correlation length of the superconductor is:

A

200 Å

B

50 Å

C

628 Å

D

2000 Å