A protein molecule's diameter is measured as 42 Å using X-ray diffraction. If another measurement instrument gives the diameter in picometers (pm), and the ratio of the two measurements is $\frac{x}{10}$, what is the value of $x$?

The dimensions of resistivity in terms of M,L,T and Q where Q stands for the dimensions of charge, is

$M{L^3}{T^{ - 1}}{Q^{ - 2}}$ is dimensions of

The dimensions of resistivity in terms of M,L,T and Q where Q stands for the dimensions of charge, is

The physical quantity having the dimensions $\left[ {{{\rm{M}}^{ - 1}}{{\rm{L}}^{ - 3}}{{\rm{A}}^2}{T^3}} \right]$ is