Consider the equation \( H=\dfrac{x^{p}\,\varepsilon^{q}\,E^{r}}{t^{s}} \). Where \( H=\) magnetic field; \( E=\) electric field, \( \varepsilon=\) permittivity, \( x=\) distance, \( t=\) time The values of \( p, q, r \) and \( s \) respectively are: