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Element X in the circuit below has a resistance $R_{x}$ which depends on the voltange $V_{x}$ on it: for $V_{x} \leq 1 V, R_{x} = 1 Ω a n d f o r V_{x} > 1 V, R_{x} = 2 Ω$ . Three such elements are connected with an ideal ammeter as shown below; the voltage on the leads (across a and b) of the circuit varies in time as shown in the graph.

Which of the following combinations of (current, time) is/are possible?
(Reading of ammeter)

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(1A, 1.5s)

(2A, 5s)

(5/3A, 5s)

(0.6A, 1.5s)

answer is A, C.

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