Which risk increases when a strong magnetic field suppresses superconductivity in a rare-earth nickel boride system?

💡 Explanation

Increased Joule heating occurs because the magnetic field breaks the superconducting state above a critical field strength. Pair breaking creates unpaired electrons resisting current flow, and electrical resistance via scattering then causes increased Joule heating; therefore, option A is correct, rather than flux pinning or phonon interactions.

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