Drift velocity $$v_d$$ varies with the intensity of electric field as per the relation: 1. $$v_{d} \propto E$$ 2. $$v_{d} \propto \frac{1}{E}$$ 3. $$v_{d}= \text{constant}$$ 4. $$v_{d} \propto E^2$$

Subtopic:  Current & Current Density |
78%
From NCERT
PMT - 1981
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What is the equivalent resistance of the circuit​​​​​?

1. $$6~\Omega$$
2. $$7~\Omega$$
3. $$8~\Omega$$
4. $$9~\Omega$$

Subtopic:  Combination of Resistors |
70%
From NCERT
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Equivalent resistance across terminals $$A$$ and $$B$$ will be:

 1 $$1~\Omega$$ 2 $$2~\Omega$$ 3 $$3~\Omega$$ 4 $$4~\Omega$$
Subtopic:  Combination of Resistors |
71%
From NCERT
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The total current supplied to the circuit by the battery is:

1. $$1~\text{A}$$
2. $$2~\text{A}$$
3. $$4~\text{A}$$
4. $$6~\text{A}$$

Subtopic:  Combination of Resistors |
65%
From NCERT
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A battery of emf $$E$$ and internal resistance $$r$$ is connected to a variable resistor $$R$$ as shown below. Which one of the following is true​​​​​​?

 1 Potential difference across the terminals of the battery is maximum when $$R=r$$. 2 Power delivered to the resistor is maximum when $$R=r$$. 3 Current in the circuit is maximum when $$R=r$$. 4 Current in the circuit is maximum when $$R>>r$$.
Subtopic:  EMF & Terminal Voltage |
64%
From NCERT
PMT - 1995
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The current in the arm $$CD$$ of the circuit will be:

1. ${i}_{1}+{i}_{2}$

2. ${i}_{2}+{i}_{3}$

3. ${i}_{1}+{i}_{3}$

4. ${i}_{1}-{i}_{2}+{i}_{3}$

Subtopic:  Kirchoff's Current Law |
85%
From NCERT
PMT - 1998
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A resistance of 4 Ω and a wire of length 5 metres and resistance 5 Ω are joined in series and connected to a cell of e.m.f. 10 V and internal resistance 1 Ω. A parallel combination of two identical cells is balanced across 300 cm of the wire. The e.m.f. E of each cell is:

1. 1.5 V

2. 3.0 V

3. 0.67 V

4. 1.33 V

Subtopic:  Meter Bridge & Potentiometer |
68%
From NCERT
PMT - 1997
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The potential difference across $$8$$ ohms resistance is $$48$$ volts as shown in the figure below. The value of potential difference across $$X$$ and $$Y$$ points will be:

1. $$160$$ volt
2. $$128$$ volt
3. $$80$$ volt
4. $$62$$ volt

Subtopic:  Kirchoff's Voltage Law |
62%
From NCERT
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The effective resistance between points $$P$$ and $$Q$$ of the electrical circuit shown in the figure is:

 1 $$\frac{2 R r}{\left(R + r \right)}$$ 2 $$\frac{8R\left(R + r\right)}{\left( 3 R + r\right)}$$ 3 $$2r+4R$$ 4 $$\frac{5R}{2}+2r$$
Subtopic:  Combination of Resistors |
76%
From NCERT
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A battery consists of a variable number $$'n'$$ of identical cells having internal resistances connected in series. The terminals of battery are short circuited and the current $$i$$ is measured. The graph below that shows the relationship between $$i$$ and $$n$$ is:

 1 2 3 4
Subtopic:  Grouping of Cells |
71%
From NCERT
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