Aparallel plate capacitor is connected to a battery for charging. after some time, while the battery is still connected to the capacitor, the distance between the capacitor plates is doubled.
which of the following statements are true ?
a) the charge on the plates does not change.
b) the capacitance doubles.
c) the potential difference of the battery is halved.
d) the electric field between the plates is halved.
e) the potential difference across the plates does not change.
f) none of the above.

Light traveling in a medium with a refractive index 1.19 is incident on a plate of another medium with index of refraction 1.79. at what angle of incidence is the reflected light fully polarized?

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?