Cell membranes contain channels that allow Na + ions to rush in. Consider a channel that has a diameter of 2.56 nm and a length of 13.0 nm. If the channel has a resistance of 18.5 G Ω , what is the resistivity rho of the solution in the channel?

An electric current is flowing through the cord below. what will happen to this current if a magnet is brought near the cord? a. the electric current will stop flowing. b. it will exert a force on the voltage. c. the resistance of the wire will decrease. d. it will exert a force on the electric current.

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

Ways that industry and agriculture use physical properties to separate substances