Four resistors are connected between terminals and as follows

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

Four resistors are connected between terminals

P

and

Q

as follows. Resistors

R_1 = 1\,\Omega

and

R_2 = 2\,\Omega

are connected in parallel. This parallel combination is connected in series with resistor

R_3 = 3\,\Omega

. The resulting series combination is then connected in parallel with resistor

R_4 = 6\,\Omega

between

P

and

Q

. What is the equivalent resistance

R_{\text{eq}}

between

P

and

Q

? (a)

3\,\Omega

(b)

\dfrac{11}{3}\,\Omega

(c)

\dfrac{66}{29}\,\Omega

(d)

\dfrac{18}{7}\,\Omega