Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 25 Q. If the same four wires are connected is series the effective resistance will be________?

Given that,
Four wires of same material, the same cross-section area and the same length .
So, resistance of each wire is R
Equivalent resistance in parallel
Now, four wires is connected in parallel
So, resistance of each wire is 100 ohm
Now, four wires is connected in series then,
The equivalent resistance
Hence, the equivalent resistance in series will be 400 ohm.

If every wire having the resistance of 1 ohm then their parallel combination would producer result of 0.25 ohm
Anyhow if we will connect them in series then their resultant would be 4 ohm