Ncert Exercises & Solutions

S is the surface of a lump of magnetic material.

1. Lines of B are necessarily continuous across S
2. Some lines of B must be discontinuous across S
3. Lines of H are necessarily continuous across S
4. Lines of H cannot all be continuous across S

(1, 4)

Magnetic field lines for magnetic induction (B) form continuous lines. So, lines of B are necessarily continuous across S.

Also, magnetic intensity H varies for inside and outside the lump. So, lines of H cannot all be continuous across S.

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