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S is the surface of a lump of magnetic material

Question:

S is the surface of a lump of magnetic material

(a) lines of B are necessarily continuous across S

(b) some lines of B must be discontinuous across S

(c) lines of H are necessarily continuous across S

(d) lines of H cannot all be continuous across S

Solution:

(a) lines of B are necessarily continuous across S

(d) lines of H cannot all be continuous across S

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