Test question about maximum voltage drop

[icx]

maximum voltage drop?

one power line is about 1000um,and every 10um it connects one uniform resistor
to ground.if power source is added on one terminal of this line, the maximum
voltage drop is 100mv.if same power source is added on both terminals of
this line,what is the maximum voltage drop?

a.10mv
b.25mv
c.50mv
d.100mv

 

[extraord]

Re: maximum voltage drop?

for the two times power supply and half resistance.
the volatage drop should be 25mv.