The minimum size that makes it possible for a planetary surface ...

[jon_i]

The minimum size that makes it possible for a planetary surface to remain habitable over long time periods is a size that allows
 
  A) plate tectonics to be present
  B) a magnetic field to be present
  C) an atmosphere to be present
  D) hot spot volcanism to be present

Question 2

A 1 mF, a 2 mF, and a 3 mF capacitor are connected in series, the combination being connected across a 9 volt battery.
 
  (a) Which capacitor has the greatest charge?
  (b) Which capacitor has the greatest voltage?

[amandalm]

Answer to Question 1

A

Answer to Question 2

(a) They all have the same charge.
(b) 1 mF

[jon_i]

Great answer, keep it coming

[sailorcrescent]

Thanks for the timely response, appreciate it