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Dec12-12, 02:04 PM
P: 12,028
Quote Quote by Meir Achuz View Post
A time varying magnetic field will have time varying vector potential
[tex]\frac{\partial{\bf A}}{\partial t}[/tex] that can exist beyond the field, and induce an E field.
Only in areas where there is a changing magnetic field.

Quote Quote by elfmotat View Post
However, (assuming ∂B/∂t isn't zero) the electric field induced will also be nonzero outside of the solenoid.
∂B/∂t ≠ 0 implies that there is a magnetic field (apart from some specific points in time maybe).