Consider the diagram shown. A voltmeter of resistance 150Ω is connected across A and B. The potential drop across B and C measured by the voltmeter is?

Correct option is A. 29V
Effective resistance of the circuit , R = 100 || 150 + 100 = (100 × 150) / (250) + 100 = 60 + 100 = 160 Ω
Current flown through the circuit, I = V/R = 50/160 = 0.3125 A
Potential difference across point B and C = 100 × 0.3125 = 31.25 V ≈ 31V