Which of the following describes a temporary magnet

1, a magnet that always acts as a magnet
2, a magnet that acts as a magnet as long as there is an external magnetic field
3, is a magnet even if there is a magnetic field or not
4, is always a magnet

Its 2 , a temporary magnet is a magnet thats only a magnet with a magnetic field. Like how horseshoe magnets cause nails to become temporary magnets

they are playing too much beyblade in the office

explanation:

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.