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NEET2009PhysicsCurrent ElectricityActual

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 the figure, is :

Options

  1. A6
  2. B0.6
  3. C3
  4. D6

Correct answer

B. 0.6

Step-by-step solution

Total resistance of wire =12 2 10⁻¹ =2.4 Resistance of each half = 2.4 2 =1.2 and as about diameter both parts are in parallel Req. = 1.2 2 =0.6

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