AP EAMCET · PHYSICS · Alternating Current
A constant voltage of \(25 \mathrm{~V}\) is applied to a series \(L-R\) circuit at \(t=0\), by closing a switch. What is the potential difference across the resistor and the inductor at time \(t=0\) ?
- A \(0 \mathrm{~V}, 25 \mathrm{~V}\)
- B \(12.5 \mathrm{~V}, 1.25 \mathrm{~V}\)
- C \(10 \mathrm{~V}, 15 \mathrm{~V}\)
- D \(25 \mathrm{~V}, 0 \mathrm{~V}\)
Answer & Solution
Correct Answer
(A) \(0 \mathrm{~V}, 25 \mathrm{~V}\)
Step-by-step Solution
Detailed explanation
At, \(t=0\), switch closes Current \(i=i_0\left[1-e^{-t R / L}\right]\) So, at \(t=0, i=0\) So, potential across inductor \(=25 \mathrm{~V}\) and across resistor \(=0 \mathrm{~V}\)
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