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A wire of resisitance 12ohms per meter is bent to form a complete circle of radius 10cm. The resistance between its two diametrically opposite points, A and B shown in the figure, is

  • Option 1)

    3\Omega

  • Option 2)

    6\pi \Omega

  • Option 3)

    6\Omega

  • Option 4)

    0.6\pi \Omega

 

Answers (1)

best_answer

As we learnt in

Ammeter -

It is a device used to measure current and always connected in series 

- wherein

Resistance of half wire = (\pi r).12

    =\pi \times 10 \times 10^{-2} \times 12=1.20\pi

R_{eff}=\frac{R}{2} (Since two half are in parallel)

    =0.60 \pi \Omega

 

 


Option 1)

3\Omega

Correct

Option 2)

6\pi \Omega

Incorrect

Option 3)

6\Omega

Incorrect

Option 4)

0.6\pi \Omega

Incorrect

Posted by

Plabita

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