Question

In the given circuit all resistors are of equal value the equivalent resistance will be maximum between the points:

• A. PR
• B. PQ
• C. RQ
• D. same for all

Answer 1

Answer: (A)

PR

Let $R$ be the resistance of each resistor.
The net resistance between P and R is $R_{PR}=R$ ; between P and Q is $R_{PQ}=R||R=(1/R+1/R{)}^{-1}=R/2$ and between R and Q is $R_{RQ}=R||R||R=(1/R+1/R+1/R{)}^{-1}=R/3$
Thus, maximum resistance is in between P and R.