CUET · PHYSICS · PYQ PAPER 2025
In the circuit diagram shown in the figure, the resistance \( R_1 = 10 \, \Omega \), \( R_2 = 15 \, \Omega \) and E= 20 V. When the switch S is closed, the ratio of \( i_1 \) to \( i_3 \) will be:
- A 6 : 5
- B 20 : 3
- C 4 : 3
- D 5 : 3
Answer & Solution
Correct Answer
(D) 5 : 3
Step-by-step Solution
Detailed explanation
\( i_3 = i_1 \frac{R_2}{R_1 + R_2} \) \( i_3 = i_1 \frac{15 \, \Omega}{10 \, \Omega + 15 \, \Omega} \) \( i_3 = i_1 \frac{15}{25} \) \( i_3 = i_1 \frac{3}{5} \) \( \frac{i_1}{i_3} = \frac{5}{3} \)
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