Acapacitor has a potential difference of v applied across its plates. if the potential difference across its plates is increased to 2v, the energy stored in the capacitor is: a) reduced to half
b) doubles
c) reduced to one fourth
d) quadruples (four times bigger)
e) none of the above

Option B. doubles

Explanation:

This can be explained by the definition of capacitance that charge on the capacitor will remain constant irrespective of the voltage applied.

This can be given as:

Q ∝ V or Q = CV

where,

Q = charge

V = Voltage

C = Capacitance

So, when V is doubled, C shoul reduce to half to main constant charge on the capacitor:

V' = 2V

C' =

Also , Energy stored in a capacitor, E is given by:

E =                             (1)

Now, when

V' = 2V

C' =

Using eqn (1):

E' =

Energy, E' =

E' = = 2E

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.