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Standard XII

Physics

RLC Circuit

In the given ...

Question

In the given circuit (fig), all the symbols have their usual meanings. At $t = 0$ , key K is closed. Now answer the following questions. At $t \to \infty$ , the equivalent resistance between A and B is :

R_{1} + R_{2} + R_{3}

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R_{1} + R_{2}

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R_{1} + R_{3}

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None of the above

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Solution

The correct option is C $R_{1} + R_{3}$
At t=infinity, C acts as open and L acts as a short,
therefore equivalent resistance = $R_{1} + R_{3}$

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Question 11
A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances $R_{1}$ , $R_{2}$ and $R_{3}$ respectively (figure). Which of the following is true?

(a) $R_{1} = R_{2} = R_{3}$
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In the given circuit (fig), all the symbols have their usual meanings. At t=0, key K is closed. Now answer the following questions. At t→∞, the equivalent resistance between A and B is :

The correct option is C R1+R3At t=infinity, C acts as open and L acts as a short, therefore equivalent resistance = R1+R3

In the given circuit (fig), all the symbols have their usual meanings. At $t = 0$ , key K is closed. Now answer the following questions. At $t \to \infty$ , the equivalent resistance between A and B is :

The correct option is C $R_{1} + R_{3}$
At t=infinity, C acts as open and L acts as a short,
therefore equivalent resistance = $R_{1} + R_{3}$