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Physics - Capacitor Question with Solution | TestHub

PhysicsCapacitorR-C CircuitMedium3 minQB

PhysicsMediummultiple choice

Figure shows a part of complete circuit at $t = 0$ . Charge on capacitor as a function of time is given by $q = 3 (2 - e^{- t})$ coulombs. At $t = 0$ , mark the correct statement(s).

Options:(select one or more)

Answer:

A, B, C, D

Solution:

$I_{C} = d q / d t = 3 e^{- t}$ ; at $t = 0$ , $I_{C} = 3 A$ towards P. (A) correct.

At $t = 0$ , $q = 3 C$ : $20 - V_{P} = q / C + 3 \times 1 = 3 + 3 = 6 \Rightarrow V_{P} = 14 V$ . (C) correct.

KCL at P: current through R is $7 A$ . (B) correct.

$V_{R} = 14 = 7 R \Rightarrow R = 2Ω$ . (D) correct.

Stream:JEESubject:PhysicsTopic:CapacitorSubtopic:R-C Circuit

⏱ 3mℹ️ Source: QB

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