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Electric Current> kindly help me in this questiion they hav...

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kindly help me in this questiion
they have asked us to ind the ratio of the resistance A and B

megha , 8 Years ago

Grade 12

2 Answers

Abc

Last Activity: 8 Years ago

the answer should be 1/3 i.e 0.333. the question can be solved by using Ohm`s law V=IR. => R=V/I . By using the angles provided in the figure, R(A) and R(B) can be found and their ratio as well.

Shreya D Nanda

Last Activity: 8 Years ago

Hi Megha!

By basic math, slope of a line is tan $\Theta$ . For line B $\theta$ =30 $\therefore tan30=1/\sqrt{3}$ . For line A, $\theta =90-30=60 \therefore tan60=\sqrt{3}$ . But from graph $tan\theta =I/V = 1/R$ [ohms law V=IR]. $\therefore R_{A}=1/tan30=\sqrt{3}$ and similarly, $\therefore R_{B}=1/tan60=1/\sqrt{3}$ . Ratio of resistance of A to that of B is, $R_{A}/R_{B}= \sqrt{3} \left ( \sqrt{3} \right )=3 \therefore R_{A}:R_{B}=3:1$ .

Thats it ...

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