Question

Find the current flowing through the resistance R₁ of the circuit shown in figure if the resistances are equal to R₁ = 10 Ω, R₂ = 20 Ω, and R₃ = 30 Ω, and the potentials of points 1, 2 and 3 are equal to φ₁ = 10 V, φ₂ = 6 V, and φ₃ = 5 V.

(A) 0.1 A 

(B) 0.2 A

(C) 0.3 A 

(D) 0.4 A

Answer 1

Correct Answer is: (B) 0.2 A

Apply KCL for circuit

6V – 60 + 3V – 18 + 2V – 10 = 0

⇒ 11V = 88

⇒ V = 8 V

current in resistance R₁ is

= 10 - 8/10 = 0.2 amp