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If a small part of this magnet loses its superconducting properties and the resistance of the magnet wire suddenly rises from 0 to a constant 0.005 Ω, how much time will it take for the current to decrease to half of its initial value?

(a) 4.7 min;

(b) 10 min;

(c) 15 min;

(d) 30 min

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