1/r=r1+r2 ?

1 Answer
Oct 23, 2015

Answer:

#r = (r_1r_2)/(r_1+r_2)#
Depending on what your question means!

Explanation:

Assumption:
r1 -> #r_1#
r2-> #r_2#

Then we have:

#1/r = 1/(r_1) + 1/(r_2)#

giving:

#1/r = (r_2 + r_1)/(r_1 r_2)#

To find r invert the whole equation giving:

#r = (r_1r_2)/(r_1+r_2)#

Is this what your question means?