- 1(current)
Q. No.In an ammeter, \(0.2 \%\) of the main current passes through the galvanometer. If the resistance of the galvanometer is \(G,\) the resistance of the ammeter will be:
| 1. | \({1 \over 499}G\) | 2. | \({499 \over 500}G\) |
| 3. | \({1 \over 500}G\) | 4. | \({500 \over 499}G\) |
Subtopic: Â Conversion to Ammeter & Voltmeter |
 55%
Level 3: 35%-60%
AIPMT - 2014
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A millivoltmeter of \(25~\text{mV}\) range is to be converted into an ammeter of \(25~\text{A}\) range. The value (in ohm) of the necessary shunt will be:
1. \(0.001\)
2. \(0.01\)
3. \(1\)
4. \(0.05\)
Subtopic: Â Conversion to Ammeter & Voltmeter |
 82%
Level 1: 80%+
AIPMT - 2012
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A galvanometer of resistance, \(G,\) is shunted by the resistance of \(S\) ohm. How much resistance is to be put in series with the galvanometer to keep the main current in the circuit unchanged?
| 1. | \({G \over (S+G)}\) | 2. | \({S^2 \over (S+G)}\) |
| 3. | \({SG \over (S+G)}\) | 4. | \({G^2 \over (S+G)}\) |
Subtopic: Â Conversion to Ammeter & Voltmeter |
Level 3: 35%-60%
AIPMT - 2011
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A galvanometer has a coil resistance of \(100~\Omega\) and gives a full-scale deflection for \(30\) mA of current. If it is to work as a voltmeter in the \(30\) V range, how much resistance does it require to be added?
1. \(900~\Omega\)
2. \(1800~\Omega\)
3. \(500~\Omega\)
4. \(1000~\Omega\)
1. \(900~\Omega\)
2. \(1800~\Omega\)
3. \(500~\Omega\)
4. \(1000~\Omega\)
Subtopic: Â Conversion to Ammeter & Voltmeter |
 80%
Level 1: 80%+
AIPMT - 2010
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A galvanometer having a coil resistance of \(60~ \Omega\) shows full-scale deflection when a current of \(1.0\) A passes through it. It can be converted into an ammeter to read currents up to \(5.0\) A by:
| 1. | Putting in parallel, a resistance of \(24~ \Omega\) |
| 2. | Putting in series, a resistance of \(15~ \Omega\) |
| 3. | Putting in series, a resistance of \(240~ \Omega\) |
| 4. | Putting in parallel, a resistance of \(15~ \Omega\) |
Subtopic: Â Moving Coil Galvanometer |Â Conversion to Ammeter & Voltmeter |
 80%
Level 1: 80%+
AIPMT - 2009
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A galvanometer of resistance \(50~\Omega\) is connected to a battery of \(3~\text V\) along with a resistance of \(2950~\Omega\) in series. A full-scale deflection of \(30\) divisions is obtained in the galvanometer. In order to reduce its deflection to \(20\) divisions, the resistance added in series should be:
1. \(1050~ \Omega\)
2. \(1550~ \Omega\)
3. \(2050~ \Omega\)
4. \(1500~ \Omega\)
1. \(1050~ \Omega\)
2. \(1550~ \Omega\)
3. \(2050~ \Omega\)
4. \(1500~ \Omega\)
Subtopic: Â Moving Coil Galvanometer |Â Conversion to Ammeter & Voltmeter |
 51%
Level 3: 35%-60%
AIPMT - 2008
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- 1(current)
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