dietsprite

5+ Year Member
Jan 25, 2010
11
0
Status
Okay so the question asks about air acting as an insulator between the thundercloud and the ground and what the effect of air is before the lightning strike...

I understand that air, acting as an insulator or a dielectric, will increase the capacitance... but why is the answer A (The air slightly reduces the potential difference between the cloud and the ground from what its value would be if air were absent)?

The teacher said: using the Q = CV formula, because Q is constant and C increases, V must decrease. Thus, choice A is the answer.

What I don't get is... Why is Q constant for this question?
 
May 29, 2011
444
1
Status
Pre-Medical
Why would the charge of a thundercloud or the "charge" of the ground change?