When a 12 Ω resistor is connected in parallel with a moving coil galvanometer, its deflection reduces from 50 divisions to 10 divisions. What will be the resistance of the galvanometer?

1. 24 Ω

2. 36 Ω

3. 48 Ω

4. 60 Ω

Subtopic:  Conversion to Ammeter & Voltmeter |
 69%
From NCERT
PMT - 2002
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A voltmeter has a resistance of G ohms and range V volts. The value of resistance used in series to convert it into a voltmeter of range nV volts is :

(1) nG

(2) (n1)G

(3) Gn 

(4) G(n1)

Subtopic:  Conversion to Ammeter & Voltmeter |
 77%
From NCERT
PMT - 1999
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Which of the following statement is wrong:

(1) Voltmeter should have high resistance

(2) Ammeter should have low resistance

(3) Ammeter is placed in parallel across the conductor in a circuit

(4) Voltmeter is placed in parallel across the conductor in a circuit

Subtopic:  Conversion to Ammeter & Voltmeter |
 69%
From NCERT
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A moving coil galvanometer has a resistance of 50 Ωand gives full scale deflection for 10 mA. How could it be converted into an ammeter with a full scale deflection for 1A :

(1) 50/99 Ω in series

(2) 50/99 Ω in parallel

(3) 0.01 Ω in series

(4) 0.01 Ω in parallel

Subtopic:  Conversion to Ammeter & Voltmeter |
 78%
From NCERT
PMT - 1996
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The resistance of an ideal voltmeter is 

(1) Zero

(2) Very low

(3) Very large

(4) Infinite

Subtopic:  Conversion to Ammeter & Voltmeter |
 68%
From NCERT
PMT - 1998
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The net resistance of a voltmeter should be large to ensure that :

1. It does not get overheated
2. It draws excessive current
3. It can measure large potential difference
4. It does not appreciably change the potential difference to be measured
Subtopic:  Conversion to Ammeter & Voltmeter |
 50%
From NCERT
PMT - 1999
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A galvanometer having a resistance of 8 ohms is shunted by a wire of resistance 2 ohms. If the total current is 1 amp, the part of it passing through the shunt will be :

(1) 0.25 amp

(2) 0.8 amp

(3) 0.2 amp

(4) 0.5 amp

Subtopic:  Conversion to Ammeter & Voltmeter |
 64%
From NCERT
PMT - 1998
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A voltmeter of resistance 1000 Ω gives full-scale deflection when a current of 100 mA flow through it. The shunt resistance required across it to enable it to be used as an ammeter reading 1 A at full-scale deflection is :

(1) 10000 Ω

(2) 9000 Ω

(3) 222 Ω

(4) 111 Ω

Subtopic:  Moving Coil Galvanometer |
 70%
From NCERT
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If an ammeter A reads 2 A and the voltmeter V reads 20 V, what is the value of resistance R? (Assuming finite resistances of ammeter and voltmeter)
     

1. Exactly 10 ohm
2. Less than 10 ohm
3. More than 10 ohm
4. We cannot definitely say

Subtopic:  Conversion to Ammeter & Voltmeter |
From NCERT
PMT - 2004
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A galvanometer has a resistance of 25 ohm and a maximum of 0.01 A current can be passed through it. In order to change it into an ammeter of range 10 A, the shunt resistance required is 

(1) 5/999 ohm

(2) 10/999 ohm

(3) 20/999 ohm

(4) 25/999 ohm

Subtopic:  Conversion to Ammeter & Voltmeter |
 84%
From NCERT
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