(a) Show that a force-free magnetic field satisfies the relation (b) Let x B = (r)...

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(a) Show that a force-free magnetic field satisfies the relation

(b) Let ∇ x B = α(r) Band show that

(c) Verify that the surfaces α = constant are made up of magnetic field lines.

(d) Show that α(r), as defined in part (b), for the force-free field, can be expressed as

(e) Prove that for the force-free field ∇B lies on the osculating plane, that is, the plane containing B and the principal normal to the field line.

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