An ideal parallel-plate capacitor consists of two parallel plates of area A separated by a distance d. This capacitor is connected to a battery that maintains a constant potential difference between the plates. If the separation between the plates is now doubled, the magnitude of the charge on the plates will

a. quadruple
b. double
c. third
d. fourth
e. half

e) half

Explanation:

as we know relation b/w charge(Q) , capacitance (C) and voltage (V) is

Q = CV (i)

we also know capacitance of a capacitor for separation d and area A is

C = ∈₀A/d (ii)

from  the above equation it is clear that C is inversely proportional to separation  if separation doubled  capacitance will reduced to half   and from equation first charge is directly proportional to capacitance.

that s why magnitude of charge will reduced to half  

so option (e) is right answer

car a and b are moving in opposite directions

plz mark.me the brainliest i rlly need this kind of yours in exchange

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.