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Q.

A wire of resistance 12 ohms per metre is bent to form a complete circle of radius 10 cm. The resistance between its two diametrically opposite points, A and B as shown in Fig, is :

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a

0.6 πΩ

b

6 Ω

c

3 Ω

d

6 πΩ

answer is B.

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Detailed Solution

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RAB=R2=12πrρ=12π x 10 x 10-2 x 12=0.6πΩ

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A wire of resistance 12 ohms per metre is bent to form a complete circle of radius 10 cm. The resistance between its two diametrically opposite points, A and B as shown in Fig, is :