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6. Electromagnetic induction — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics6. Electromagnetic induction1 Mark
MCQ
A blackbox $(BB)$ which may contain a combination of electrical circuit elements (resistor, capacitor or inductor) is connected with other external circuit elements as shown below in the figure $(A)$. After the switch $S$ is closed at time $t=0$, the current $I$ as a function of time $t$ is shown in the figure $(B)$. From this we can infer that the blackbox contains
  • A
    a resistor and a capacitor in series
  • B
    a resistor and a capacitor in parallel
  • ✓
    a resistor and an inductor in series
  • D
    a resistor and an inductor in parallel
✓

Answer

Correct option: C.
a resistor and an inductor in series
c
(c)

As current increases exponentially and reaches its maximum value and af ter that it is constant. So, box contains a resistor and an inductor in series combination.

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