  A single Majorana Kramers pair hosts only one component of the magnetic
multipole. This can be used to determine the bulk Cooper-pair symmetry through
surface-sensitive spectroscopic measurements, either by applying a magnetic
field or by using a ferromagnet/superconductor junction. This paper proposes
that the electric response, which is free from the Meissner effect, can be used
an alternative method to measure the bulk Cooper-pair symmetry in
time-reversal-invariant superconductors with double Majorana Kramers pairs. The
relationships among electric multipoles, strain tensors and superconducting
symmetries under a given wallpaper group on the surfaces of topological
crystalline superconductors are shown. This study also reveals that only a
specific irreducible representation of a uniform strain yields a gap in the
double Majorana Kramers pairs for the topological-crystalline-superconductor
candidate Sr$_3$SnO. This highlights the viability of electric detection
regarding Cooper-pair symmetry.
