The value of k (the electrical constant in Coulomb's Law) .
Question 13 options:
1) depends on the separation distance between the two charges
2) is impossible to determine
3) is different when used to determine the electric field strength instead of the electric force
4) never changes
5) depends on how many charged particles are present

Acarpenter builds an exterior house wall with a layer of wood 2.9 cm thick on the outside and a layer of styrofoam insulation 2.3 cm thick on the inside wall surface. the wood has k=0.080w/(m⋅k), and the styrofoam has k= 0.010 w/(m⋅k). the interior surface temperature is 19.0 ∘c , and the exterior surface temperature is -15.0 ∘c . a.)what is the temperature at the plane where the wood meets the styrofoam? celsius b.)what is the rate of heat flow per square meter through this wall? /m^2