Manipal MET2021PhysicsCurrent Electricity
A current of 2 A flows in the system of conductors as shown in the figure. The potential difference V_P-V_R will be :
Options
- A- 2 V
- B- 1 V
- C+ 1 V
- D+ 2 V
Correct answer
B. - 1 V
Step-by-step solution
Resistance between Q and S , R^ = 5 10 5+10 = 50 15 = 10 3 Potential difference across Q and S , V_Q-V_S=2 10 3 = 20 3 ~V Current through arm QPS, aligned I₁ & = 20 3 5 = 4 3 ~A V_Q-V_P & = 4 3 2= 8 3 ~V aligned Current through arm QRS, aligned I₂ & = 20 3 10 = 2 3 ~A V_Q-V_R & = 2 3 3=2 ~V aligned Hence, aligned V_P-V_R & = (V_Q-V_R )- (V_Q-V_P ) & =2- 8 3 =- 2 3 -1 ~V aligned