Tantalum crystallizes into a body-centered cubic lattice with an edge a = 3 A, and is a type I superconductor with Tc = 4.4 K. Assuming that each tantalum atom donates one electron to the conduction band, the effective mass of which is equal to the mass of a free electron, estimate from energy considerations, the magnitude of the induction of the critical magnetic field Bc at T ~ 0 K as the field in which Cooper pairs are destroyed.

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