- #1
coquelicot
- 299
- 67
Homework Statement
B = variable magnetic field, of constant direction (e.g B = b cos(wt) N, where N=const vect)
A = magnetic potential vector of B
R = vector from some origin O to a point M
It is assumed that no exterior electric potential is present.
Problem: to find the electric field E at M caused by the variable magnetic field.
Homework Equations
A=1/2 B x R (A depends on the origin O, but this is OK since the magnetic potential vector is not uniquely determined).
E = -dA/dt (Maxwell-Faraday, since there no exterior electric potential is present)
It follows immediately that E = 1/2 dB/dt x R, but then, the electric field depends on the position of the origin O, an absurdity since the electric field is uniquely defined.
What's wrong?