COMEDK2013PhysicsAlternating Current
In an L-C-R circuit, the potential difference between the terminals of the inductance is 60 ~V , between the terminals of the capacitor is 30 ~V and that between the terminals of resistance is 40 ~V . The supply voltage will be equal to
Options
- A130 ~V
- B10 ~V
- C50 ~V
- D70 ~V
Correct answer
C. 50 ~V
Step-by-step solution
Given, V_ R =40 ~V , V_ L =60 ~V , V_ C =30 ~V For an L-C-R circuit, the supply voltage aligned V &= V_ R ²+ (V_ L -V_ C )² &= 40²+(60-30)² &= 40²+30² &= 1600+900 = 2500 =50 ~V aligned