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(C) In an $LR$ circuit, when a $DC$ voltage $V$ is applied, the current $I$ at any time $t$ is given by the equation $I(t) = \frac{V}{R}(1 - e^{-Rt/L}

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$A$ resistor and an inductor in series

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(C) In an $LR$ circuit, when a $DC$ voltage $V$ is applied, the current $I$ at any time $t$ is given by the equation $I(t) = \frac{V}{R}(1 - e^{-Rt/L})$.Initially, at $t = 0$, the current is $I = 0$ because the inductor opposes the change in current.As time $t$ increases, the current gradually rises and approaches a steady-state value of $I_{max} = \frac{V}{R}$ as $t 	o \infty$.This behavior matches the description provided in the question.Therefore, the circuit contains a resistor and an inductor in series.

When a $DC$ voltage is applied at the two ends of a circuit kept in a closed box, it is observed that the current gradually increases from zero to a certain value and then remains constant. What do you think the circuit contains?

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