Galvanometer

Q.

When the Wheatstone bridge is in balance condition, the current through the galvanometer will be?

Q.

Does the Galvanometer show the direction of Current?

Q. Galvanometer works on the principle that the angle of turn of device, is directly proportional to current through Galvanometer.

1. True
2. False

Q.

Does galvanometer have high resistance?

Q. Paragraph for below question

नीचे दिए गए प्रश्न के लिए अनुच्छेद

For the shown AC circuit, answer the following question.

दर्शाए गए AC परिपथ के लिए, निम्नलिखित प्रश्न का उत्तर दीजिए।


Q. Value of I is

प्रश्न - I का मान है

1. 50 A
2. $50\sqrt{2}$ A
3. 100 A
4. 25 A

Q. A moving coil galvanometer is converted into an ammeter reading upto 0.03 A by connecting a shunt of resistance 4r across it and into an ammeter reading upto 0.06 A when a shunt of resistance r connected across it. What is the maximum current which can be sent through this galvanometer if no shunt is used.

1. 0.01 A
2. 0.02 A
3. 0.03 A
4. 0.04 A

Q. A galvanometer can deflect in both directions showing direction of current but an ammeter cannot.

1. False
2. True

Q. A moving coil galvanometer of resistance $20\Omega$ gives a full scale deflection when a current of $1\text{mA}$ is passed through it. It is to be converted into an ammeter reading $20\text{A}$ on full scale. But the shunt of $0.005\Omega$ only is available. What resistance should be connnected in series with the galvanometer coil?

1. $39.995\Omega$
2. $60.995\Omega$
3. $79.995\Omega$
4. $80.995\Omega$

Q. A moving coil galvanometer of resistance $100\Omega$ is used as an ammeter using a resistance $0.1\Omega$. The maximum deflection current in the galvanometer is $100\mu \text{A}$. Find the minimum current in the circuit, so that the ammeter shows maximum deflection

1. $100.1\text{mA}$
2. $1000.1\text{mA}$
3. $10.01\text{mA}$
4. $1.01\text{mA}$

Q.

The galvanometer shown in the figure has a resistance $50\Omega$ and full-scale deflection current 1 mA. What are the the resistances $R_1,R_2$ and $R_3$ required to convert it into ammeter having ranges as indicated?

1. $\frac{1}{22}\Omega ,\frac{1}{33}\Omega ,\frac{1}{44}\Omega$

2. $\frac{1}{22}\Omega ,\frac{15}{33}\Omega ,\frac{1}{100}\Omega$

3. $\frac{1}{198}\Omega ,\frac{1}{22}\Omega ,\frac{15}{33}\Omega$

4. $\frac{1}{22}\Omega ,\frac{15}{198}\Omega ,\frac{5}{44}\Omega$

Q. Paragraph for below question
नीचे दिए गए प्रश्न के लिए अनुच्छेद

For the shown AC circuit, answer the following question.

दर्शाए गए AC परिपथ के लिए, निम्नलिखित प्रश्न का उत्तर दीजिए।


Q. Value of current I is

प्रश्न - धारा I का मान है

1. 50 A
2. 100 A
3. $50\sqrt{2}A$
4. 40 A

Q. How does a ammeter differ from an galvanometer?

1. The galvanometer alone can measure extremely small currents. The ammeter cannot.
2. The galvanometer can deflect in both directions showing direction of current. The ammeter cannot.
3. The ammeter has a shunt connected in series. Galvanometer does not.
4. Ammeter is connected in series in the arm where you want to measure current. Galvanometer is connected in parallel.

Q. A galvanometer of coil resistance $99\Omega$ is converted into an ammeter using shunt of $1\Omega$ and is connected as shown in Figure - 1. Ammeter reads 3A. If same galvanometer is converted into voltmeter by connecting a $101\Omega$ resistance in series this voltmeter reads $\frac{4}{5}$ of full scale reading as shown in Figure - 2

1. Internal resistance of cell is $r=1.01\Omega$
2. Range of ammeter is 5A
3. Range of voltmeter is 10V
4. Full scale deflection current of galvanometer is 0.05A

Q. Paragraph for below question

नीचे दिए गए प्रश्न के लिए अनुच्छेद

For the shown AC circuit, answer the following question.

दर्शाए गए AC परिपथ के लिए, निम्नलिखित प्रश्न का उत्तर दीजिए।


Q. Value of current I is

प्रश्न - धारा I का मान है

1. 50 A
2. $25\sqrt{2}$ A
3. 25 A
4. $\frac{25}{\sqrt{2}}$ A

Q. A galvanometer shows a reading of $0.65\text{mA}$. When a galvanometer is shunted with a $4\Omega$ resistance, the deflection is reduced to $0.13\text{mA}$. If the galvanometer is further shunted with a $2\Omega$ wire, the new reading will be (the main current remains the same)

1. $0.60\text{mA}$
2. $0.08\text{mA}$
3. $0.12\text{mA}$
4. $0.05\text{mA}$

Q. Galvanometer works on the principle that the angle of turn of device, is directly proportional to current through Galvanometer.

1. True
2. False

Q. A galvanometer, having a resistance of $50\Omega$ gives a full scale deflection for a current of 0.05 A. the length in meter of a resistance wire of area of cross-section $2.97\times {10}^{-2}c{m}^2$ that can be used to convert the galvanometer into an ammeter which can read a maximum of 5A current is : ( Specific resistance of the wire $=5\times {10}^{-7}\Omega m$)

1. 9
2. 6
3. 3
4. 1.5