A heat sink with square fins of width w joined to a chip has an interfacial contact resistance rₜ,c = 5 × 10⁻⁶ m² · K/w. Calculate the total resistance for n fins.
a) n rₜ,c
b) (n/w) rₜ,c
c) (n w/2) rₜ,c
d) (2 n/w) rₜ,c