A) become half
B) become double
C) remain the same
D) become four times
Correct Answer: D
Solution :
Critical field \[(\mu )\] is nearly proportional to the square of the transition temperature. \[{{\mu }_{c}}\propto {{\theta }^{2}}\] \[\therefore \] \[\frac{\mu _{c}^{}}{{{\mu }_{c}}}=\frac{{{(2\theta )}^{2}}}{{{\theta }^{2}}}=4\] \[\Rightarrow \] \[\mu _{c}^{}=4\,{{\mu }_{c}}\]
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