(i) A particle carrying a charge of e travels in a circular path in a uniform magnetic field. If instead the particle carried a charge of 2e, the radius of the circular path would have been A) one-fourth the original radius. B) four times the original radius. C) one-half the original radius. D) twice the original radius. E) none of the above

answer: option c. i.e. electric current flowing “downhill” from the negative electrode to the positive electrode in a battery

explanation:

the water analogy to the circuits define the pipes (water flows) to the electric current. now, we know that the electric current flows from the positive terminal to the circuit (as shown in the diagram attached).

hence, option c is the correct answer.

answer; (d) spontaneous processes are characterized by the overall conversion of order to disorder;

show the wavelengths of a wave. show the crests of a wave.

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.