Which of the following acts as a superconductor at \( 4 \mathrm{~K} \) ? (a) \( \mathrm{He} \) (...

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Which of the following acts as a superconductor at \( 4 \mathrm{~K} \) ?
(a) \( \mathrm{He} \)
(b) \( \mathrm{Cu} \)
(c) \( \mathrm{K} \)
(d) \( \mathrm{Mg} \)
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