One of two identical metal spheres has a charge of +q and the other sphere has a charge of –q. The spheres are brought together momentarily and then separated. Compared to the total charge on the two spheres before contact, the total charge on the two spheres after contact is (a) less, and each sphere will have a charge of –q
(b) greater, and each sphere will have a charge of +q
(c) the same and each sphere will have a charge of 0

In what direction does the medium move relative to the direction of the wave? explain.

The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 7.0 × 10-6 c/m2. (a) what is the magnitude of the electric field within the cell membrane? (b) find the magnitude of the electric force that would be exerted on a potassium ion (k+; charge = +e) placed inside the membrane.

Which of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above