AP EAMCET · PHYSICS · Current Electricity
A battery of emf \(12 \mathrm{~V}\) and internal resistance \(4 \Omega\) is connected to a resistor. The resistance of the resistor if the current in the circuit is \(0.8 \mathrm{~A}\) is
- A \(11 \Omega\)
- B \(9 \Omega\)
- C \(15 \Omega\)
- D \(13 \Omega\)
Answer & Solution
Correct Answer
(A) \(11 \Omega\)
Step-by-step Solution
Detailed explanation
The circuit can be drawn as Current in circuit, \(I=\frac{E}{r+R}\) Substituting given values, we get, \(0.8=\frac{12}{R+4}\) \(\Rightarrow \quad R+4=15 \Rightarrow R=11 \Omega\)
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