A power source of 6.0 V is attached to the ends of a
capacitor. The charge is 12 C.

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible