A resistance R is connected in series with a parallel combination of two resistances 12 Ω and 8 Ω. If the power dissipated in the circuit is 70 𝑊 when the applied voltage is 20 𝑉 across the circuit. The resistance 𝑅 will be nearly:
A. 1.07 Ω
B. 0.91 Ω
C. 0.83 Ω
D. 0.75 Ω
Answer:B
A resistance R is connected in series with a parallel combination of two resistances 12 Ω and 8 Ω. If the power dissipated in the circuit is 70 𝑊 when the applied voltage is 20 𝑉 across the circuit. The resistance 𝑅 will be nearly:
A. 1.07 Ω B. 0.91 Ω C. 0.83 Ω D. 0.75 Ω