An observer `A` and `a` charge `Q` are fixed in a stationary frame `F_(1)`. An observer `B` is fixed in a frame `F_(2)` which is moving with respect to `F_(1)`

Options

A. Both `A` and `B` will observe electric fields.
B. Both `A` and `B` will observe magnetic fields.
C. Neigher `A` nor `B` wil observe magnetic fields.
D. `B` will observe a magnetic field, but `A` will not.

Answer

A, D