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WorksheetsEMAGS
Total questions: 32
Worksheet time: 16mins
How many times greater is the mass of the proton over the mass of electron?
1836
0.9986
1838
1.0014
Suppose there is an atom of oxygen, containing eight protons and eight neutrons in the nucleus, and two neutrons are added to the nucleus. The resulting atomic weight is about:
12
10
16
18
Which of the following shells contain 18 electrons?
L
N
M
K
In materials, what do you call the region that separates the valence and conduction bands
Energy gap
Forbidden band
Insulation band
Energy gap or forbidden band
Determine the force in Newton between two 4 uC charges by 0.1 meter in air.
1.44 N
144 N
14.4 N
1440 N
Find the electric field intensity 10 cm form a charge Q = 5 nC
450 N/C
900 N/C
4.5 kN/C
900 kN/C
What is the static charge that can be stored by your body as you walk across a carpet?
300 volts
30,000 volts
3,000 volts
Over 30,000 volts
A wire carries 6.2414 x 10^18 electrons per second. The current in amperes is:
1 A
0.5 A
2 A
0.25 A
A 2 nC point charge will produce what potential at 2 m away?
4 volts
7.5 volts
6 volts
9 volts
When a 12.0 V car battery runs a single 30.0 W headlight, how many electrons pass through it each second?
1.56x10^19 electrons
1.65x10^19 electrons
1.56x10^18 electrons
1.65x10^18 electrons
A material has a resistivity of 50 ohm-cm and a cross sectional area of 10 sq. mm. Determine the resistance of 8 meters of this material.
400 kΩ
40 kΩ
40 MΩ
40 Ω
A material having a temperature coefficient of 1.8x10^-4/°C at room temperature is heated up to 50°C. If its resistance at room temperature is 14 ohms, find its new resistance
14.4 ohms
14.1 ohms
14.8 ohms
15.2 ohms
A resistor has a value of 200 ohms at temperature of 20°C. The resistor is heated up to 90°C. Determine the new resistance given that the temperature coefficient at 20°C is 0.004.
241 ohms
122 ohms
256 ohms
264 ohms
Which of the following wires has the least resistance?
9 AWG
22 AWG
14 AWG
30 AWG
How much voltage is required to charge a 1.4 uF capacitor to 5.6 uC?
4 V
2 V
1 V
0.5 V
What determines the capacitance of a capacitor?
The material between the plates, the area of one side of one plate, the number of plates and the spacing between the plates
The material between the plates, the number of plates and the size of the wires connected to the plates
The number of plates, the spacing between the plates and whether the dielectric material is N type or P type
The material between the plates, the area of one plate, the number of plates and the material used for the protective coating
A capacitor is composed of two plates. Each plate has an area of 7 square inches. The plates are separated by a 2-inch thick paraffin paper (k=3.5) dielectric. What is its capacitance?
2.76 uF
2.76 pF
5.51 uF
5.51 pF
Which type of component is generally not practical for fabrication in an IC?
inductors
diodes
resistors
capacitors
Determine the inductance of an inductor with cross-sectional area of 100 mm^2 with a material of relative permeability of 10 and a length of 1 m. Assume that the coil is wound 10 times.
12.6 uH
1.26 uH
0.126 uH
126 uH
One 10-H coil and one 20-H coil are connected in series and are physically close enough to each other so that their coefficient of coupling is 0.5. What is the mutual inductance between the coils?
2.00 H
9.82 H
2.21 H
7.07 H
Suppose two inductors, having values of 44.0 mH and 88.0 mH, are connected in series with a coefficient of coupling equal to 1.0 (the maximum possible mutual inductance). Determine the total inductance if they aid each other.
7.55 mH
2.11 mH
256 mH
213 mH
When the number of turns is increased in a coil from 2 to 4, the total inductance will increase by a factor of
eight
six
two
four
Determine the magnetic flux density of a material in gauss if its cross-sectional area is 4 cm^2 and 14 mWb of net flux crosses it.
350,000 gauss
3,500 gauss
35,000 gauss
350 gauss
Three amperes of current flows through a magnetic coil wound 14 turns. Determine the corresponding magnetomotive force in Gilbert.
25.8 Gilberts
28.5 Gilbers
85.2 Gilberts
52.8 Gilberts
If a 50 turn coil has 2 amperes of current flowing through it and a core length of 2 inches, it's magnetizing force is:
24.8 gilberts
24.8 Oersted
24.8 gauss
24.8 maxwell
If the flux density for a given mmf is half that of the magnetic field strength, what happens to the absolute permeability?
Halved
Reduced
Doubled
Remains the same
What is the reluctance of a magnetic path having a length of 2 x 10^-3 m and a cross-sectional area of 2.5 x 10^-3 m^2? The relative permeability is 100.
6366 At/Wb
80 At/Wb
3636 At/Wb
35.63 At/Wb
A conductor carries a current of 70A at right-angles to a magnetic field having a flux density of 1.5 T. If the length of the conductor in the field is 200 mm calculate the force acting on the conductor.
21 N
42 N
14 N
28 N
An electron travels at a speed of 0.6 c under the influence of an 8 mT magnetic field. If the force from the charge is 1.1536 x 10^-13 N, solve for the angle between the electron and the magnetic field.
15 deg
20 deg
30 deg
45 deg
A 2-meter conductor, moving at a rate of 14 m/s cuts a magnetic flux density of 5 mT at right angles. Calculate the voltage induced in the conductor.
0.12 V
0.20 V
0.35 V
0.14 V
Let the thumb, first finger and second finger of the left hand be extended such that they are all at right-angles to each other. If the first finger points in the direction of the magnetic field, the second finger points in the direction of the current, then the thumb will point in the direction of the motion of the conductor.
Fleming's left-hand rule
grip left-hand rule
screw rule
Helix left-hand rule
Let the thumb, first finger and second finger of the right hand be extended such that they are all at right angles to each other. If the first finger points in the direction of the magnetic field and the thumb points in the direction of motion of the conductor relative to the magnetic field, then the second finger will point in the direction of the induced e.m.f.
Fleming's right-hand rule
grip right-hand rule
screw rule
Helix right-hand rule
