As part of a Griffiths problem, I have a charged capacitor placed in a uniform magnetic field which points in +x direction. the capacitor plates are parallel to xy planes. Suddenly, the B field starts decreasing in magnitude...what is the direction of the induced E field? It makes most sense to me that the induced E field is parallel to y axis, but I do not know which direction. If I imagine just a single layer of E field lines parallel to xy plane and pointing in -y direction, then below the layer, the induced B field will point in +x direction, which is what we want. However, above the layer, the B field will point in -x direction....which is not what we want. Furthermore, if we stack these layers, the resultant B field induced should just be zero... Any help in improving my understanding is appreciated!