In the ladder network shown, current through the resistor \( 3 \Omega \) is \( 0.25 \mathrm{~A} ...

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In the ladder network shown, current through the resistor \( 3 \Omega \) is \( 0.25 \mathrm{~A} \). The input voltage ' \( \mathrm{V} \) ' is equal to
(A) \( 10 \mathrm{~V} \)
(B) \( 20 \mathrm{~V} \)
(C) \( 5 \mathrm{~V} \)
(D) \( \frac{15}{2} \mathrm{~V} \)
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