362959
Statement A : Galvanometer cannot as such be used as an ammeter to measure the value of the current in a given circuit. Statement B : Galvanometer gives a full-scale deflection for a current of the order of micro ampere.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Galvanometer is a very sensituve device, it gives full-scale deflection for current of the order of micro ampere. Also for measuring current the galvanometer has to be connected in series, and as it has a large resistance, this will change the value of the current in the circuit. To overcome these difficulties one attaches a small resistance called shunt resistance in parallel with galvometer coil. So option (3) is correct.
PHXII04:MOVING CHARGES AND MAGNETISM
362960
An ammeter reads 500\(mA\). When a shunt of \(0.1 \Omega\) is connected across the ammeter its reading drops to 50\(mA\). The resistance of the ammeter is
1 \(1.1 \Omega\)
2 \(1 \Omega\)
3 \(0.9 \Omega\)
4 None of these
Explanation:
The current distribution is shown in the figure. \(50R = 450(0.1) \Rightarrow R = 0.9\Omega \)
PHXII04:MOVING CHARGES AND MAGNETISM
362961
What is the value of shunt which passes \(10 \%\) of the main current through a galvanometer of \(99 \Omega\) ?
1 \(11 \Omega\)
2 \(1 \Omega\)
3 \(9 \Omega\)
4 \(5 \Omega\)
Explanation:
The shunt resistance is given by \(S=\dfrac{I_{G} G}{\left(I-I_{G}\right)}\) \(G = 99\Omega \,\) and \({I_G} = (10/100)I = 0.1I\) \(S = \frac{{0.1I \times 99}}{{(I - 0.1I)}} = \frac{{0.1}}{{0.9}} \times 99 = 11\Omega \)
PHXII04:MOVING CHARGES AND MAGNETISM
362962
Assertion : Out of galvanometer, ammeter and voltmeter, resistance of ammeter is lowest and resistance of voltmeter is highest. Reason : An ammeter is connected in series and a voltmeter is connected in parallel, in a circuit.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Ammeter shall show reading almost equal to actual current in circut. Ammeters have low resistance to minimize the impact on current measurement in series, while voltmeters have high resistance in parallel to minimize the current drawn during voltage measurement, accurately explaining their designs. So correct option is (1).
362959
Statement A : Galvanometer cannot as such be used as an ammeter to measure the value of the current in a given circuit. Statement B : Galvanometer gives a full-scale deflection for a current of the order of micro ampere.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Galvanometer is a very sensituve device, it gives full-scale deflection for current of the order of micro ampere. Also for measuring current the galvanometer has to be connected in series, and as it has a large resistance, this will change the value of the current in the circuit. To overcome these difficulties one attaches a small resistance called shunt resistance in parallel with galvometer coil. So option (3) is correct.
PHXII04:MOVING CHARGES AND MAGNETISM
362960
An ammeter reads 500\(mA\). When a shunt of \(0.1 \Omega\) is connected across the ammeter its reading drops to 50\(mA\). The resistance of the ammeter is
1 \(1.1 \Omega\)
2 \(1 \Omega\)
3 \(0.9 \Omega\)
4 None of these
Explanation:
The current distribution is shown in the figure. \(50R = 450(0.1) \Rightarrow R = 0.9\Omega \)
PHXII04:MOVING CHARGES AND MAGNETISM
362961
What is the value of shunt which passes \(10 \%\) of the main current through a galvanometer of \(99 \Omega\) ?
1 \(11 \Omega\)
2 \(1 \Omega\)
3 \(9 \Omega\)
4 \(5 \Omega\)
Explanation:
The shunt resistance is given by \(S=\dfrac{I_{G} G}{\left(I-I_{G}\right)}\) \(G = 99\Omega \,\) and \({I_G} = (10/100)I = 0.1I\) \(S = \frac{{0.1I \times 99}}{{(I - 0.1I)}} = \frac{{0.1}}{{0.9}} \times 99 = 11\Omega \)
PHXII04:MOVING CHARGES AND MAGNETISM
362962
Assertion : Out of galvanometer, ammeter and voltmeter, resistance of ammeter is lowest and resistance of voltmeter is highest. Reason : An ammeter is connected in series and a voltmeter is connected in parallel, in a circuit.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Ammeter shall show reading almost equal to actual current in circut. Ammeters have low resistance to minimize the impact on current measurement in series, while voltmeters have high resistance in parallel to minimize the current drawn during voltage measurement, accurately explaining their designs. So correct option is (1).
362959
Statement A : Galvanometer cannot as such be used as an ammeter to measure the value of the current in a given circuit. Statement B : Galvanometer gives a full-scale deflection for a current of the order of micro ampere.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Galvanometer is a very sensituve device, it gives full-scale deflection for current of the order of micro ampere. Also for measuring current the galvanometer has to be connected in series, and as it has a large resistance, this will change the value of the current in the circuit. To overcome these difficulties one attaches a small resistance called shunt resistance in parallel with galvometer coil. So option (3) is correct.
PHXII04:MOVING CHARGES AND MAGNETISM
362960
An ammeter reads 500\(mA\). When a shunt of \(0.1 \Omega\) is connected across the ammeter its reading drops to 50\(mA\). The resistance of the ammeter is
1 \(1.1 \Omega\)
2 \(1 \Omega\)
3 \(0.9 \Omega\)
4 None of these
Explanation:
The current distribution is shown in the figure. \(50R = 450(0.1) \Rightarrow R = 0.9\Omega \)
PHXII04:MOVING CHARGES AND MAGNETISM
362961
What is the value of shunt which passes \(10 \%\) of the main current through a galvanometer of \(99 \Omega\) ?
1 \(11 \Omega\)
2 \(1 \Omega\)
3 \(9 \Omega\)
4 \(5 \Omega\)
Explanation:
The shunt resistance is given by \(S=\dfrac{I_{G} G}{\left(I-I_{G}\right)}\) \(G = 99\Omega \,\) and \({I_G} = (10/100)I = 0.1I\) \(S = \frac{{0.1I \times 99}}{{(I - 0.1I)}} = \frac{{0.1}}{{0.9}} \times 99 = 11\Omega \)
PHXII04:MOVING CHARGES AND MAGNETISM
362962
Assertion : Out of galvanometer, ammeter and voltmeter, resistance of ammeter is lowest and resistance of voltmeter is highest. Reason : An ammeter is connected in series and a voltmeter is connected in parallel, in a circuit.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Ammeter shall show reading almost equal to actual current in circut. Ammeters have low resistance to minimize the impact on current measurement in series, while voltmeters have high resistance in parallel to minimize the current drawn during voltage measurement, accurately explaining their designs. So correct option is (1).
362959
Statement A : Galvanometer cannot as such be used as an ammeter to measure the value of the current in a given circuit. Statement B : Galvanometer gives a full-scale deflection for a current of the order of micro ampere.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Galvanometer is a very sensituve device, it gives full-scale deflection for current of the order of micro ampere. Also for measuring current the galvanometer has to be connected in series, and as it has a large resistance, this will change the value of the current in the circuit. To overcome these difficulties one attaches a small resistance called shunt resistance in parallel with galvometer coil. So option (3) is correct.
PHXII04:MOVING CHARGES AND MAGNETISM
362960
An ammeter reads 500\(mA\). When a shunt of \(0.1 \Omega\) is connected across the ammeter its reading drops to 50\(mA\). The resistance of the ammeter is
1 \(1.1 \Omega\)
2 \(1 \Omega\)
3 \(0.9 \Omega\)
4 None of these
Explanation:
The current distribution is shown in the figure. \(50R = 450(0.1) \Rightarrow R = 0.9\Omega \)
PHXII04:MOVING CHARGES AND MAGNETISM
362961
What is the value of shunt which passes \(10 \%\) of the main current through a galvanometer of \(99 \Omega\) ?
1 \(11 \Omega\)
2 \(1 \Omega\)
3 \(9 \Omega\)
4 \(5 \Omega\)
Explanation:
The shunt resistance is given by \(S=\dfrac{I_{G} G}{\left(I-I_{G}\right)}\) \(G = 99\Omega \,\) and \({I_G} = (10/100)I = 0.1I\) \(S = \frac{{0.1I \times 99}}{{(I - 0.1I)}} = \frac{{0.1}}{{0.9}} \times 99 = 11\Omega \)
PHXII04:MOVING CHARGES AND MAGNETISM
362962
Assertion : Out of galvanometer, ammeter and voltmeter, resistance of ammeter is lowest and resistance of voltmeter is highest. Reason : An ammeter is connected in series and a voltmeter is connected in parallel, in a circuit.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Ammeter shall show reading almost equal to actual current in circut. Ammeters have low resistance to minimize the impact on current measurement in series, while voltmeters have high resistance in parallel to minimize the current drawn during voltage measurement, accurately explaining their designs. So correct option is (1).
