a long solenoid has inside a coil of fine wire coaxial with it. What is the mutual inductance between the solenoid and the inner coil

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

this could be newton#'s law of cooling. the cooling curve is exponential

part 1: which substance has a higher solubility?

a

smallest amount left undissolved atall temps in table shown most has dissolved high sol'by