你上次託我幫你問的事情，我已經問過了，不能勃起可能是因為手淫過頻導致的，手淫過頻容易導致前列腺發炎，可能會引起不孕不育，嚴重者甚至會導致陽痿，打你手機沒人接，只能在這裡給你留言了。

Cool guy

As shown in the following figure, two concentric spherical surfaces have the radius
of R1=0.1m and R2=0.15m, respectively. They are also uniformly distributed with the
charge of Q1=20nC and Q2=10nC, respectively. Axis-r is an axis extending outward
from the center of the spherical surfaces.(a) Find the electric field and the electric potential at the points 𝑟 = 0.05m, 𝑟 =
0.12m and 𝑟 = 0.2m, respectively.
(b) Find the potential difference between two spherical surfaces.

-rep

cheater

bot