Question 218: Current Electricity

Question

Two identical cells each of emf 1.5 V are connected in parallel across a parallel combination of two resistors each of resistance 20 $$\Omega$$. A voltmeter connected in the circuit measures 1.2 V. The internal resistance of each cell is :

Accepted Answer

$${{1.5 	imes 10} \over {10 + {r \over 2}}} = 1.2$$
$$\Rightarrow$$ r = 5 $$\Omega$$

Answer

2.5 $$\Omega$$

Answer

4 $$\Omega$$

Answer

5 $$\Omega$$

Answer

10 $$\Omega$$

Current Electricity

Two identical cells each of emf 1.5 V are connected in parallel across a parallel combination of two resistors each of resistance 20 $\Omega$. A voltmeter connected in the circuit measures 1.2 V. The internal resistance of each cell is :

Choose the correct answer: