In an electromagnetic system, a quantity defined as the ratio of electric dipole moment and magnetic dipole moment has dimension of \( M^{P} L^{Q} T^{R} A^{S} \). The value of \( P \) and \( Q \) are:
\( -1, 1 \)
\( 0, -1 \)
\( 1, -1 \)
\( -1, 0 \)