UPSC CDS Science Physics Questions Part 1

According to formula,
R=

ρl

A

where
R = resistance of the conductor (ohms, Ω)
ρ = resistivity of the conductor material (ohm meter, Ω m)
l = length of conductor (m)
A = cross-sectional area of conductor (m2)
When connected in series
R(TOTAL)=R1+R2=‌‌

R+R

4

R(TOTAL)=‌‌

5R

4