the key is pressed at time t = 0. Which of the following statements is are true ?
Sahay Sir > Question Answers > the key is pressed at time t = 0. Which of the following statements is are true ?
An accumulator of emf 2 V and negligible internal resistance is connected across a uniform wire of length 10 m and resistance 30Ω The appropriate terminals of a cell of emf 1.5V and internal resistance 1Ω is connected to one end of the wire and the other terminal of the cell is connected through a sensitive galvanometer to a slider on the wire. What is the length of the wire that will be required to produce zero deflection of the galvanometer? How will the balancing length change? (a) When a coil of resistance 5Ω is placed in series with the accumulator. (b) The cell of 1.5 V is shunted with 5Ω resistor?
13
Nov
An accumulator of emf 2 V and negligible internal resistance is connected across a uniform wire of length 10 m and resistance 30Ω The appropriate terminals of a cell of emf 1.5V and internal resistance 1Ω is connected to one end of the wire and the other terminal of the cell is connected through a [...]
A 6 volt battery of negligible internal resistance is connected across a uniform wire AB of length 100cm. The positive terminal of another battery of emf 4V and internal resistance 1Ω is joind to the point A as shown in figure. Take the potential at B to be zero. (a) What are the potentials at the points A and C ? (b) At which D of the wire AB, the potential is equal to the potential at C. ( c) If the point C and D are connected by a wire. What will be the current through is ? (d) Id the 4V battery is replaced by 7.5 V battery, what would be the answers of parts (a) and (b) ?
13
Nov
A 6 volt battery of negligible internal resistance is connected across a uniform wire AB of length 100cm. The positive terminal of another battery of emf 4V and internal resistance 1Ω is joind to the point A as shown in figure. Take the potential at B to be zero. (a) What are the potentials at [...]
Figure shows a potentiometer arrangemeter with RAB = 10Ω and rheostat of variable resistance d. For x=0 null deflection point is found at 20cm from A. For unknown value of x null deflection point was at 30 cm from A, then the value of x is
13
Nov
Figure shows a potentiometer arrangemeter with RAB = 10Ω and rheostat of variable resistance d. For x=0 null deflection point is found at 20cm from A. For unknown value of x null deflection point was at 30 cm from A, then the value of x is In the circuit shown below the key is pressed [...]
In the experiment of calibration of voltmeter, a 1.1 volt standard cell gets balanced at 440 cm length of the wire. The balancing length corresponding to a potential difference between the ends of a resistance comes out to be 190 cm. A voltmeter shows 0.5 volt for this potential difference. The error in the reading of voltmeter will be
13
Nov
In the experiment of calibration of voltmeter, a 1.1 volt standard cell gets balanced at 440 cm length of the wire. The balancing length corresponding to a potential difference between the ends of a resistance comes out to be 190 cm. A voltmeter shows 0.5 volt for this potential difference. The error in the reading [...]
The variation of potential difference V with length l in case of two potentiometers X and Y is as shows in Fig. 6.21. Which of these two will you perfer for comparing the emfs of the two cells and why ?
13
Nov
The variation of potential difference V with length l in case of two potentiometers X and Y is as shows in Fig. 6.21. Which of these two will you perfer for comparing the emfs of the two cells and why ? In the circuit shown below the key is pressed at time t = 0. [...]
A battery of emf 1.4 V and internal resistance 2 Ω is connected to a resistor of 100 ω resistance through an ammeter. This resistance of the ammeter is 4/3Ω. A voltmeter has also been connected to find the potential difference across the resistor. a. Draw the circuit diagram. b. The ammeter reads 0.02A. What is the resistance of the voltmeter? c. The voltmeter reads 1.1 V. What is the error in the reading?
13
Nov
A battery of emf 1.4 V and internal resistance 2 Ω is connected to a resistor of 100 ω resistance through an ammeter. This resistance of the ammeter is 4/3Ω. A voltmeter has also been connected to find the potential difference across the resistor. a. Draw the circuit diagram. b. The ammeter reads 0.02A. What [...]
A galvanometer (coil resistance 99Ω.) is converted into an ammeter using a shunt of 1Ω and connected as shown in figure (a). The ammeter reads 3A. The same galvanometer is convened into a voltmeter by connecting a resistance of 101Ω in series. This voltmeter is connected at, shown in figure (b). Its reading is found to be 4/5 of the full scale reading. Find : (a) internal resistance r of the cell (b) range of the ammeter and voltmeter (c) full scale deflection current of the galvanometer.
13
Nov
A galvanometer (coil resistance 99Ω.) is converted into an ammeter using a shunt of 1Ω and connected as shown in figure (a). The ammeter reads 3A. The same galvanometer is convened into a voltmeter by connecting a resistance of 101Ω in series. This voltmeter is connected at, shown in figure (b). Its reading is found [...]
Resistance R1 and R2 each 60 Ω are connected in series as shown in Fig. The Potential difference between A and B is kept 120 volt. Then what will be the reading of voltmeter connected between the point C & D if resistance of voltmeter is 120 Ω
13
Nov
Resistance R1 and R2 each 60 Ω are connected in series as shown in Fig. The Potential difference between A and B is kept 120 volt. Then what will be the reading of voltmeter connected between the point C & D if resistance of voltmeter is 120 Ω In the circuit shown below the key [...]
Two cells A and B of emf 1.3 V and 1.5 V respectively are arranged as shown in figure. The voltmeter reds 1.45V. The voltmeter is assumed to be ideal. Find the ratio of the internal resistance of the batteries R1 /R2 = ?
13
Nov
Two cells A and B of emf 1.3 V and 1.5 V respectively are arranged as shown in figure. The voltmeter reds 1.45V. The voltmeter is assumed to be ideal. Find the ratio of the internal resistance of the batteries R1 /R2 = ? In the circuit shown below the key is pressed at time [...]
It is required to measure the resistance of a circuit operating at 120 V. There is only one galvanometer of current sensitivity 10^−6 A per division. How should the galvanometer be connected in the circuit to operate an ohmmeter? Why minimum resistance can be measured with such a galvanometer if its full-scale has 40 divisions?
13
Nov
It is required to measure the resistance of a circuit operating at 120 V. There is only one galvanometer of current sensitivity 10^−6 A per division. How should the galvanometer be connected in the circuit to operate an ohmmeter? Why minimum resistance can be measured with such a galvanometer if its full-scale has 40 divisions? [...]