# A potentiometer wire has a length of $$4​​~\text{m}$$ and resistance  $$8~\Omega.$$  The resistance that must be connected in series with the wire and an energy source of emf $$2~\text{V}$$, so as to get a potential gradient of $$1~\text{mV}$$ per cm on the wire is: 1. $$32~\Omega$$ 2. $$40~\Omega$$ 3. $$44~\Omega$$ 4. $$48~\Omega$$

Subtopic:  Meter Bridge & Potentiometer |
65%
From NCERT
NEET - 2015
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$$\mathrm{A, B}~\text{and}~\mathrm{C}$$ are voltmeters of resistance $$R$$, $$1.5R$$ and $$3R$$ respectively as shown in the figure above. When some potential difference is applied between $$\mathrm{X}$$ and $$\mathrm{Y}$$, the voltmeter readings are $${V}_\mathrm{A}$$, $${V}_\mathrm{B}$$ and $${V}_\mathrm{C}$$ respectively. Then:

 1 $${V}_\mathrm{A} ={V}_\mathrm{B}={V}_\mathrm{C}$$ 2 $${V}_\mathrm{A} \neq{V}_\text{B}={V}_\mathrm{C}$$ 3 $${V}_\mathrm{A} ={V}_\mathrm{B}\neq{V}_\mathrm{C}$$ 4 $${V}_\mathrm{A} \ne{V}_\mathrm{B}\ne{V}_\mathrm{C}$$

Subtopic:  Kirchoff's Voltage Law |
65%
From NCERT
NEET - 2015
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Across a metallic conductor of non-uniform cross-section, a constant potential difference is applied. The quantity which remains constant along the conductor is:
 1 current density 2 current 3 drift velocity 4 electric field
Subtopic:  Current & Current Density |
59%
From NCERT
NEET - 2015
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Two cities are $$150~\text{km}$$ apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is $$8$$ volts and the average resistance per km is $$0.5~\text{ohm}$$. The power loss in the wire is:
1. $$19.2~\text{W}$$
2. $$19.2~\text{kW}$$
3. $$19.2~\text{J}$$
4. $$12.2~\text{kW}$$

Subtopic:  Heating Effects of Current |
82%
From NCERT
AIPMT - 2014
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The figure given below shows a circuit when resistances in the two arms of the meter bridge are $$5~\Omega$$ and $$R$$, respectively. When the resistance $$R$$ is shunted with equal resistance, the new balance point is at $$1.6l_1$$. The resistance $$R$$ is:

1. $$10~\Omega$$
2. $$15~\Omega$$
3. $$20~\Omega$$
4. $$25~\Omega$$

Subtopic:  Meter Bridge & Potentiometer |
73%
From NCERT
AIPMT - 2014
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A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of $$2.0~\text{V}$$ and negligible internal resistance. The potentiometer wire itself is $$4~\text{m}$$ long. When the resistance, $$R$$, connected across the given cell, has values of (i) infinity (ii) $$9.5$$, the 'balancing lengths, on the potentiometer wire, are found to be $$3~\text{m}$$ and $$2.85~\text{m}$$, respectively. The value of the internal resistance of the cell is (in ohm):
1. $$0.25$$
2. $$0.95$$
3. $$0.5$$
4. $$0.75$$

Subtopic:  Meter Bridge & Potentiometer |
65%
From NCERT
AIPMT - 2014
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A wire of resistance $$4~\Omega$$ is stretched to twice its original length. The resistance of a stretched wire would be:

 1 $$4~\Omega$$ 2 $$8~\Omega$$ 3 $$16~\Omega$$ 4 $$2~\Omega$$
Subtopic:  Derivation of Ohm's Law |
83%
From NCERT
AIPMT - 2013
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Internal resistance of a $$2.1~\text{V}$$ cell which gives a current of $$0.2~\text{A}$$ through a resistance of $$10~\Omega$$ is:
1. $$0.5~\Omega$$
2. $$0.8~\Omega$$
3. $$1.0~\Omega$$
4. $$0.2~\Omega$$
Subtopic:  EMF & Terminal Voltage |
83%
From NCERT
AIPMT - 2013
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The resistances of the four arms $$P,Q,R~\text{and}~S$$ in a Wheatstone’s bridge are $$10~\Omega,30~\Omega,30~\Omega$$ and $$90~\Omega$$ respectively. The emf and internal resistance of the cell are $$7~\text{volt}$$ and $$5~\Omega$$ respectively. If the galvanometer resistance is $$50~\Omega$$ the current drawn from the cell will be:
1. $$0.2~\text{A}$$
2. $$0.1~\text{A}$$
3. $$2.0~\text{A}$$
4. $$1.0~\text{A}$$

Subtopic:  Wheatstone Bridge |
76%
From NCERT
AIPMT - 2013
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In the circuit shown cells, $$A$$ and $$B$$ have negligible resistance. For $$V_A =12 ~\text{V}$$, $$R_1 = 500 ~\Omega$$, and $\mathrm{}$$$R = 100 ~\Omega$$ the galvanometer $$(\text{G})$$ shows no deflection. The value of $$V_B$$ is:

1. $$4$$ V
2. $$2$$ V
3. $$12$$ V
4. $$6$$ V

Subtopic:  Kirchoff's Voltage Law |
73%
From NCERT
AIPMT - 2012
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