Question

The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-section and same material is $0.25\, \Omega$. What will be the effective resistance if they are connected in series?

• A. $0.25\, \Omega$
• B. $0.5\, \Omega$
• C. $1\, \Omega$
• D. $4\, \Omega$

Answer 1

Answer: (D)

If the wires are connected in parallel then
$R _{ eq }= R / 4=0.25$
$\Rightarrow R =1 \Omega$
So, after they are connected in series
$R _{ eq }=4 R =4 \Omega$