Concepts Of Physics MCQ Edition [Volume 2]PhysicsElectric Current in Conductors
For the circuit shown in the figure, determine the current through the 10 resistor when the switch S is open.
Options
- A0.15 A
- B0.05 A
- C0.3 A
- D0.1 A
Correct answer
D. 0.1 A
Step-by-step solution
When the switch S is open, the 10 and 20 resistors are in series. Equivalent resistance of the circuit, R_ eq = 10 + 20 = 30 . Current through the circuit, I = V R_ eq = 3 30 = 0.1 A . Since the resistors are in series, the current through the 10 resistor is 0.1 A .