As the switch S is closed in the circuit

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Target Exam

CUET

Subject

Physics

Chapter

Current Electricity

Question:

As the switch S is closed in the circuit shown in figure, current passing through it is

Options:

4.5 A

6.0 A

3.0 A

Zero

Correct Answer:

4.5 A

Explanation:

Let the potential at junction C, is V. Applying Krchhoff’s junction law at the junction

or $\frac{20-V}{2}+\frac{5-V}{4}=\frac{V-0}{2}$

or 5 V = 45

∴ V = 9 V

∴ Current through switch S, $i_3=\frac{9}{2}$ = 4.5 A