Which of the following best describes a capacitor?
a. two moving point charges that exert an electric force
b. two stationary point charges that create an electric field
c. two parallel metal plates that can store charge
d. two perpendicular metal plates that can store energy

It's C : )

C:Two parallel metal plates that can store charge

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.

a.   mass number from atomic number