Differentiation of
with respect to r is
.
Explanation:
We have the following equation:
y=2V/r or
, we need to differentiate y with respect r , We know a formula of Differentiation that

i.e. differentiation of
is
.
Now , let's solve this :
⇒

⇒

⇒

⇒

⇒

∴ Differentiation of
with respect to r is
.