MHT CET · Physics · Current Electricity
The figure shows currents in a part of electric circuit. Then current \(I\) is
- A 3.5 A
- B 4 A
- C 1.5 A
- D 2.5 A
Answer & Solution
Correct Answer
(A) 3.5 A
Step-by-step Solution
Detailed explanation
According to Kirchhoff's first law,
At junction \(\mathrm{A}, \mathrm{I}_{\mathrm{A}}=1+4=5 \mathrm{~A}\)
At junction \(\mathrm{B}, \mathrm{I}_{\mathrm{A}}=\mathrm{I}_{\mathrm{BC}}+0.5 \Rightarrow \mathrm{I}_{\mathrm{BC}}=4.5 \mathrm{~A}\)
At junction \(\mathrm{C}, \mathrm{I}=\mathrm{I}_{\mathrm{BC}}-1=4.5-1=3.5 \mathrm{~A}\)
At junction \(\mathrm{A}, \mathrm{I}_{\mathrm{A}}=1+4=5 \mathrm{~A}\)
At junction \(\mathrm{B}, \mathrm{I}_{\mathrm{A}}=\mathrm{I}_{\mathrm{BC}}+0.5 \Rightarrow \mathrm{I}_{\mathrm{BC}}=4.5 \mathrm{~A}\)
At junction \(\mathrm{C}, \mathrm{I}=\mathrm{I}_{\mathrm{BC}}-1=4.5-1=3.5 \mathrm{~A}\)
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