Permeability is the condition of being capable of having materials flow into and out of a membrane. the permeability of a cell membrane is determined by how easily a molecule can diffuse across the membrane. usually, only molecules that are fat-soluble can permeate across a cell membrane. why is this the case?

Permeability is the condition of being capable of having materials flow into and out of a membrane. The permeability of a cell membrane is determined by how easily a molecule can diffuse across the membrane. Usually, only molecules that are fat-soluble can permeate across a cell membrane. This is because the layer that is exposed on the linings of the cell membrane is nonpolar and can therefore allow the fat-soluble molecule to pass through.

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.