The resistance of \(1~\text{A}\) ammeter is \(0.018~\Omega\). To convert it into \(10~\text{A}\) ammeter, the shunt resistance required will be:
1. \(0.18~\Omega\)
2. \(0.0018~\Omega\)
3. \(0.002~\Omega\)
4. \(0.12~\Omega\)

Subtopic:  EMF & Terminal Voltage |
 69%
From NCERT
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For measurement of potential difference, the potentiometer is preferred in comparison to the voltmeter because:

1. the potentiometer is more sensitive than the voltmeter.

2. the resistance of the potentiometer is less than
    the voltmeter.

3. the potentiometer is cheaper than the voltmeter.

4. the potentiometer does not take current from the circuit.

Subtopic:  Meter Bridge & Potentiometer |
 61%
From NCERT
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The potential gradient along the length of a uniform wire is \(10~\text{V/m}\). \(B\) and \(C\) are the two points at \(30~\text{cm}\) and \(60~\text{cm}\) point on a meter scale fitted along the wire. The potential difference between \(B\) and \(C\) will be:
1. \(3~\text{V}\)
2. \(0.4~\text{V}\)
3. \(7~\text{V}\)
4. \(4~\text{V}\)

Subtopic:  Meter Bridge & Potentiometer |
 80%
From NCERT
PMT - 1986
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In Wheatstone's bridge P = 9 ohm, Q = 11 ohm, R = 4 ohm and S = 6 ohm. How much resistance must be put in parallel to the resistance S to balance the bridge 

(1) 24 ohm

(2) 449ohm

(3) 26.4 ohm

(4) 18.7 ohm

Subtopic:  Wheatstone Bridge |
 70%
From NCERT
PMT - 1999
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A potentiometer is an ideal device of measuring potential difference because

(1) It uses a sensitive galvanometer

(2) It does not disturb the potential difference it measures

(3) It is an elaborate arrangement

(4) It has a long wire hence heat developed is quickly radiated

Subtopic:  Meter Bridge & Potentiometer |
 75%
From NCERT
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A battery of 6 volts is connected to the terminals of a three metre long wire of uniform thickness and resistance of the order of 100 Ω. The difference of potential between two points separated by 50cm on the wire will be :

(1) 1 V

(2) 1.5 V

(3) 2 V

(4) 3 V

Subtopic:  Kirchoff's Voltage Law |
 69%
From NCERT
PMT - 1984
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A potentiometer is used for the comparison of e.m.f. of two cells E1 and E2. For cell E1 the no deflection point is obtained at 20cm and for E2 the no deflection point is obtained at 30cm. The ratio of their e.m.f.'s will be 

(1) 2/3

(2) 1/2

(3) 1

(4) 2

Subtopic:  Meter Bridge & Potentiometer |
 90%
From NCERT
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If the length of the potentiometer wire is increased, then the length of the previously obtained balance point will :

(1) Increase

(2) Decrease

(3) Remain unchanged

(4) Become two times

Subtopic:  Meter Bridge & Potentiometer |
 60%
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If in the experiment of Wheatstone's bridge, the positions of cells and galvanometer are interchanged, then balance points will

(1) Change

(2) Remain unchanged

(3) Depend on the internal resistance of cell and resistance of galvanometer

(4) None of these

Subtopic:  Wheatstone Bridge |
 78%
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Two cells when connected in series are balanced on 8m on a potentiometer. If the cells are connected with polarities of one of the cells  reversed, they balance on 2m. The ratio of e.m.f.'s of the two cells is

(1) 3 : 5

(2) 5 : 3

(3) 3 : 4

(4) 4 : 3

Subtopic:  Grouping of Cells |
 80%
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