Question

The effective resistance between $P$ and $Q$ of the electrical circuit shown in the figure is

• A. $(5R /2) + 2r$
• B. $8R (R + r)/(3R + r)$
• C. $2Rr/(R+r)$
• D. $2 r + 4R$

Answer 1

Answer: (C)

$2Rr/(R+r)$

Answer 2

Equivalent circuits of given circuit are shown.