NEET 2021 Physics and Chemistry

All the wires are identical and of same material so they will have same value of resistance. Let it be R.
When these are (four) connected in parallel.
RP=

R

4

‌‌‌‌(

1

RP

=

1

R1

+

1

R2

+

1

R3

+

1

R4

)
Given RP=0.25Ω
∴0.25=

R

4

∴R=1Ω
Now these four resistances are arranged in series
RS=R+R+R+R=4R
∴RS=4×1=4Ω