A wire of resistance 24 ohms is bent in the form of a
circular ring. The effective resistance between the two
points on any diameter of the circle is

(1) 24 ohms

(2) 12 ohms

(3) 6 ohms

(4) 3 ohms

Answer Posted / nihal

As a diameter divides a circle exactly half a way, so the wire too is divided halvely. Thus the length of each 2 segments is half of original. Thus resistance of each is halved. As the 2 segments is between the same 2 points, the combination is parallel. Then,
R=(12*12)/(12+12)=6 ohms

Is This Answer Correct ?    22 Yes 4 No



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