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Electric Circuits
A rod of 5.0m length is held horizontally and with its axis in an east-west direction. It is allowed to fall straight down. What is the emf induced in it when its speed is 3.0m/s if the earth's magnetic field is 06010−4T with a dip angle of 53 degrees?
Electric Circuits
A certain inductor has an indutance of 0.50H and a resistance of 2.0. It is placed in series with a swtich, a 12.0-V battery and a 4.0 ohms resistor. Find the time constant of the circuit and the energy stored in the inductor.
Electric Circuits
Can a semiconductor excite while absorbing an electric pulse?
I mean if an electric pulse conductS a semiconductor, does that semiconductor excite and as a result emit a photon? if yes, how?
I don't refer to metals or insulators, but I mean and am talking exactly about semiconductors. And I do mean exactly the smallest and weakest possible electric pulse you can imagine. Knowing these details I want to find out that if it is possible to cause a semiconductor in normal conditions (room temperature and pressure, not high temperatures) excite and thereafter causing it emitting a photon.
I mean if an electric pulse conductS a semiconductor, does that semiconductor excite and as a result emit a photon? if yes, how?
I don't refer to metals or insulators, but I mean and am talking exactly about semiconductors. And I do mean exactly the smallest and weakest possible electric pulse you can imagine. Knowing these details I want to find out that if it is possible to cause a semiconductor in normal conditions (room temperature and pressure, not high temperatures) excite and thereafter causing it emitting a photon.
Electric Circuits
Three 1.50V dry cellsare connected in series to give a total voltage of 4.50V. A 12.0W lamp is connected in a circuit with the three dry cells. Draw a schematic circuit diagram showing the dry cells and the lamp. Place an ammeter in the circuit to measure the current through the circuit. Place a voltmeter in the circuit to measure the potential difference across the battery.
Electric Circuits
Three 1.50V dry cells are connected in series to give a total voltage of 4.50V. A 12.0W lamp is connected in a circuit with the three dry cells.
a)Draw a schematic circuit diagram showing the dry cells and the lamp. Place an ammeter in the circuit to measure the current through the circuit. Place a voltmeter in the circuit to measure the potential different across the battery.
a)Draw a schematic circuit diagram showing the dry cells and the lamp. Place an ammeter in the circuit to measure the current through the circuit. Place a voltmeter in the circuit to measure the potential different across the battery.
Electric Circuits
The starter motor in a car is a small but powerful electrical device that "turns over" the gasoline-powered engine, moving it through a cycle to get it started. The starter may draw 1.80X10^2 A from the 12.0 V battery for 2.00s.
a)What is the source of the emf in this case?
b)If the time starter was running doubled, by how much would the number of electrons running in the circuit change?
a)What is the source of the emf in this case?
b)If the time starter was running doubled, by how much would the number of electrons running in the circuit change?
Electric Circuits
1) An emf of 5V is suddenly applied to an LR circuit. The value of the resistor in the circuit is 15 Ê. At one inductive time constant, what is the rate at which energy is delivered by the battery?
a) 1.05W
b) 5.78W
c) 120.42W
d) 12.24W
2) A certain inductor has an indutance of 0.50H and a resistance of 2.0. It is placed in series with a swtich, a 12.0-V battery and a 4.0 ohms resistor. Find the time constant of the circuit and the energy stored in the inductor.
a) 0.83s and 100J
b) 0.032s and 20J
c) 0.47s and 5J
d) 0.083s and 1J
a) 1.05W
b) 5.78W
c) 120.42W
d) 12.24W
2) A certain inductor has an indutance of 0.50H and a resistance of 2.0. It is placed in series with a swtich, a 12.0-V battery and a 4.0 ohms resistor. Find the time constant of the circuit and the energy stored in the inductor.
a) 0.83s and 100J
b) 0.032s and 20J
c) 0.47s and 5J
d) 0.083s and 1J
Electric Circuits
5) A galvanometer with coil resistance
12.0Ω
shows full scale deflection for a current of 2.5mA. How would you convert it into a voltmeter of range 0 to 10.0V?
a) 3988Ω
in series
b) 0.43Ω
in parallel
c) Ω
in parallel
d) 1.62Ω
in series
6) A series circuit consisting of an uncharged 42ÖF capacitor and
10MΩ
resistor is connected to 100V power source. What are the current in the circuit and the charge on the capacitor after one time constant?
a) 3.7μA
and
126μC
b) 4.6μA
and
221μC
c) 7.2μA
and
100μC
d) 1.3μA
and
52μC
12.0Ω
shows full scale deflection for a current of 2.5mA. How would you convert it into a voltmeter of range 0 to 10.0V?
a) 3988Ω
in series
b) 0.43Ω
in parallel
c) Ω
in parallel
d) 1.62Ω
in series
6) A series circuit consisting of an uncharged 42ÖF capacitor and
10MΩ
resistor is connected to 100V power source. What are the current in the circuit and the charge on the capacitor after one time constant?
a) 3.7μA
and
126μC
b) 4.6μA
and
221μC
c) 7.2μA
and
100μC
d) 1.3μA
and
52μC
Electric Circuits
13) A battery charger supplies 10 A to charge a storage battery which has an open - circuit voltage of 5.6 V. If the voltmeter connected across the charger reads 6.8V, what is the internal resistance of the battery at this time?
a) 1.3Ω
b) 0.52Ω
c) 0.12Ω
d) 2.1Ω
14) A battery of e.m.f. and negligible internal resistance is connected to two resistors of resistances
R1
and
R−2
as shown in the figure. What is the potential difference across the resistor of resistance
R2
a) E(R1+R2)R1
b) ER2(R1+R2)
c) E(R1+R2)R2
d) ER2R1
a) 1.3Ω
b) 0.52Ω
c) 0.12Ω
d) 2.1Ω
14) A battery of e.m.f. and negligible internal resistance is connected to two resistors of resistances
R1
and
R−2
as shown in the figure. What is the potential difference across the resistor of resistance
R2
a) E(R1+R2)R1
b) ER2(R1+R2)
c) E(R1+R2)R2
d) ER2R1
Electric Circuits
A particular application requires a 48V power supply, capable of supplying up to 960W. If a single solar cell is able to supply a current of 2A at a voltage of 0.6V, an array of such cells that would just meet the specification would consist of:(select one)a. 80 parallel-connected sets of cells,where each set consists of 10 cells connected in series. b.160 parallel-connected sets of cells,where each set consists of 20 cells connected in series. c.10 parallel-connected sets of cells, where each set consists 160 cells connected in series. d. 10 parallel-connected sets of cells, where each set consists of 80 cells connected in series. e. 20 parallel-connected sets of cells, where each set consists of 160 cells connected in series.
