Question

In the circuit shown here, what is the value of the
unknown resistance R so that the total resistance
of the circuit between points 'P' and 'Q' is also equal
to R:-
(1) 322
1012
w
p 312
(2) 392
w
322
w
(3) 6912
(4) 10 22​

Answer 1

R=3+10×(3+R)10+3+R=3+30+10R13+R R=39+3R+30+10R13+R=69+13R13+R         13R+R2=69+13R Þ R=69−−√Ω.