A wire of uniform resistance 
is bent into a circle of radius 
and another piece of wire with length 
is connected between points 
and 
as shown in figure. The equivalent resistance between points 
and 
is 
.
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
The wire bent into a circle of radius 
has resistance 
for the semicircular arcs, and the straight wire of length 
has resistance 
. The three paths between A and B (two semicircular arcs of the circle and one straight wire through center) are in parallel.
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