# The current in a wire varies with time according to the relation $$i = (3+2t)~\text{A}$$. The amount of charge passing a cross section of the wire in the time interval $$t=0$$ to $$t = 4.0~\text{s}$$  would be: (where $$t$$ is time in seconds) 1. $$28$$ C 2. $$30.5$$ C 3. $$8$$ C 4. $$82$$ C

Subtopic:  Current & Current Density |
85%
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In the circuit shown, the value of each of the resistances is $$r$$. The equivalent resistance of the circuit between terminals $$A$$ and $$B$$ will be:

 1 $$\dfrac{4r}{3}$$ 2 $$\dfrac{3r}{2}$$ 3 $$\dfrac{r}{3}$$ 4 $$\dfrac{8r}{7}$$
Subtopic:  Combination of Resistors |
69%
From NCERT
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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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If a metallic block has no potential difference applied across it, then the mean velocity of free electron is:
($$T$$= absolute temperature of the block)
 1 proportional to $$T$$. 2 proportional to$$\sqrt{T}$$ 3 zero. 4 finite but independent of temperature.
Subtopic:  Current & Current Density |
52%
From NCERT
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A wire of resistance $$R$$ is divided into $$10$$ equal parts. These parts are connected in parallel, the equivalent resistance of such connection will be:
1. $$0.01R$$
2. $$0.1R$$
3. $$10R$$
4. $$100R$$

Subtopic:  Combination of Resistors |
63%
From NCERT
PMT - 1973
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In the figure, the value of resistors to be connected between $$C$$ and $$D$$ so that the resistance of the entire circuit between $$A$$ and $$B$$ does not change with the number of elementary sets used is:

 1 $$R$$ 2 $$R(\sqrt{3}-1)$$ 3 $$3R$$ 4 $$R(\sqrt{3}+1)$$
Subtopic:  Combination of Resistors |
56%
From NCERT
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A battery of emf $$10$$ V is connected to resistance as shown in the figure below. The potential difference $$V_{A} - V_{B}$$
between the points $$A$$ and $$B$$ is:

1. $$-2$$ V

2. $$2$$ V

3. $$5$$ V

4. $$\frac{20}{11}~\text{V}$$

Subtopic:  Kirchoff's Voltage Law |
67%
From NCERT
PMT - 1994
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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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If each resistance in the figure is $$9~\Omega$$, then the reading of the ammeter is:

1. $$5~\text{A}$$
2. $$8~\text{A}$$
3. $$2~\text{A}$$
4. $$9~\text{A}$$

Subtopic:  Combination of Resistors |
61%
From NCERT
PMT - 2000
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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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