SATHEE: Current Electricity 2 Question 1

Current Electricity 2 Question 1

1. To verify Ohm’s law, a student connects the voltmeter across the battery as shown in the figure. The measured voltage is plotted as a function of the current and the following graph is obtained

(2019, Main, 12 April I)

If $V_{0}$ is almost zero, then identify the correct statement.

(a) The emf of the battery is $1.5 V$ and its internal resistance is $1.5 Ω$

(b) The value of the resistance $R$ is $1.5 Ω$

(d) The emf of the battery is $1.5 V$ and the value of $R$ is $1.5 Ω$

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Solution:

Given circuit in a series combination of internal resistance of cell $(r)$ and external resistance $R$ .

$∴$ Effective resistance in the circuit,

$R_{e f f} = r + R$

$∴$ Current in the circuit,

$I = \frac{E}{R + r} or E = I R + I r$

Voltage difference across resistance $R$ is $V$ , so

$E = V + I r$

Now, from graph at $I = 0, V = 1.5 V$

From Eq. (i) at $I = 0$ ,

$E = V = 1.5 V$

At $I = 1000 m A$ (or $1 A$ ), $V = 0$

From Eq. (i) at $I = 1 A$ and $V = 0$

$\Rightarrow E = I \times r = r$

From Eqs. (ii) and (iii), we can get

$\begin{aligned} r & = E = V = 1.5 V \\ ∴ & r & = 1.5 Ω \end{aligned}$

पिछला

अगला

Current Electricity 2 Question 1

1. To verify Ohm’s law, a student connects the voltmeter across the battery as shown in the figure. The measured voltage is plotted as a function of the current and the following graph is obtained

Solution:

इंजीनियरिंग की तैयारी

चिकित्सा तैयारी

एनसीईआरटी पुस्तकें और समाधान

महत्वपूर्ण संसाधन

अन्य संसाधन

पाठ्यक्रम

परीक्षा मंच

नमूना मॉक टेस्ट

सदस्यता

एनसीईआरटी व्यायाम वीडियो समाधान

Current Electricity 2 Question 1

1. To verify Ohm’s law, a student connects the voltmeter across the battery as shown in the figure. The measured voltage is plotted as a function of the current and the following graph is obtained

Solution:

इंजीनियरिंग की तैयारी

चिकित्सा तैयारी

एनसीईआरटी पुस्तकें और समाधान

महत्वपूर्ण संसाधन

अन्य संसाधन

पाठ्यक्रम

परीक्षा मंच

नमूना मॉक टेस्ट

सदस्यता

एनसीईआरटी व्यायाम वीडियो समाधान

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