A galvanometer has a coil resistance of 100 Ω 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 $\Omega$

A galvanometer with a resistance of 36 Ω is changed into an ammeter by using a shunt of 4 Ω. The fraction f0 of total current passing through the galvanometer will be:

1. $\frac{1}{40}$

2. $\frac{1}{4}$

3. $\frac{1}{140}$ 

4. $\frac{1}{10}$

The galvanometer of resistance 80 Ω deflects a full scale for a potential of 20 mV. How much resistance is required for a voltmeter to deflect a full scale of 5 V to be made using this galvanometer?

A galvanometer having a coil resistance of \(60~\Omega\) shows full-scale deflection when a current of 1.0 A passes through it. How can we convert it into an ammeter capable of reading currents up to 5.0 A?

A milliammeter of 10 mA has a coil resistance of 1 Ω. To use it as an ammeter of range 1 A, the required shunt must have a resistance of:

1. \(\frac{1}{101}~\Omega \)

2. \(\frac{1}{100}~\Omega \)

3. \(\frac{1}{99}~\Omega \)

4. \(\frac{1}{9}~\Omega \)

A galvanometer of resistance 240 Ω allows only 4% of the main current after connecting a shunt resistance. What is the value of shunt resistance?

1.  10 $\mathrm{\Omega }$

2.  20 $\mathrm{\Omega }$

3.  8 $\mathrm{\Omega }$

4.  5 $\mathrm{\Omega }$

What properties will a galvanometer that is acting as a voltmeter have?

On connecting a shunt of \(10 ~ \Omega,\) the deflection in a moving coil galvanometer falls from 40 divisions to 6 divisions. What is the resistance of the galvanometer?

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

1. 0.25 amp

2. 0.8 amp

3. 0.2 amp

4. 0.5 amp