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Q 1/30
Score 0
A constant current of 2 A flows through a circuit element. In 10 seconds, how much net charge passes through the element?
30
200 C
20 C
2 C
0.2 C
Q 2/30
Score 0
A capacitor is charged 0.23 watt-second of energy at a voltage of 48 volts. What is its capacitance?
30
240 µF
180 µF
200 µF
220 µF
30 questions
Q.
A constant current of 2 A flows through a circuit element. In 10 seconds, how much net charge passes through the element?
1
30 sec
Q.
A capacitor is charged 0.23 watt-second of energy at a voltage of 48 volts. What is its capacitance?
2
30 sec
Q.
A capacitor of 0.0005 µF is to be formed from tin foils, measuring 3 cm x i.5 cm. The dielectric to be used is 0.5 mm mica film. Determine the number of tin foils required. The relative permittivity of mica is 4.5.
3
30 sec
Q.
What is the work done in moving a 50-µC electric charge through a distance of 50 cm in the direction of a uniform electric field of 50 kV/m?
4
30 sec
Q.
Four 3-pC charges are at the corners of a 1m square. The two charges on the left side of the square are positive. The two charges on the right side are negative. What is the field E (mv/m) at the center of the square when Er = 1?
5
30 sec
Q.
An equal number of electrons is placed on two metal spheres 3.0 cm apart in air. How many electrons are on each sphere if the resultant force is 4 kN?
6
30 sec
Q.
How many electrons must be placed on each of two spheres separated by 4mm in order to produce a repulsive force of 500 N?
7
30 sec
Q.
Two point charges 10 cm apart exerts a force of 1 x 10^-3 gram on each other. If the charges are of the same value, what is each charge in statcoulomb?
8
30 sec
Q.
A parallel plate capacitor, having plates of 100 cm^2 area, is immersed in oil of relative permittivity 10. The plates are charged to a p.d. of 50 KV and the distance between them is 2cm Determine the force between the two plates.
9
30 sec
Q.
Two equally charged spheres repel each other with a force of 0.1 kg. If their centers are 20 cm apart, find the charge on each.
10
30 sec
Q.
Two condensers of 3 and 5 μF respectively are connected in parallel. The combination is charged with 0.0056 coulomb. What is the charged in the 3μF condenser in coulombs?
11
30 sec
Q.
The area of one plate of a two-plate mica capacitor is 0.0025 m^2 and the separation between plates is 0.02 m. If the dielectric constant of mica is 7, what is the capacitance of the capacitor?
12
30 sec
Q.
Find the capacitor of parallel plate capacitor having a mica as dielectric, ϵr = 6, plate area of 12 square inches and a separation of 0.01 inch.
13
30 sec
Q.
If the charged accumulated on two parallel conductors charged to 4 is 500 pC, what is the capacitance of the parallel conductors?
14
30 sec
Q.
A certain precision 1 microfarad capacitor has very high resistance material used between its conducting surface. The capacitor is charged to 1 volt at t = 0 and disconnected from the source. It is found that the voltage drops to a 0.80 v in 1 hr. What is the insulator resistance?
15
30 sec
Q.
A cube 2m on the side is located in the first octant in a Cartesian coordinate system with one of its corner at the origin. What is the charge contained in the cube if the charge density is given by P = (xy^2) e^-2z mc/m^3?
16
30 sec
Q.
Two electrons have a force of 3.46 x 10^6 N. What is the distance between them?
17
30 sec
Q.
An iron ring 100 cm mean circumference is made from a round iron of cross-section 10^- 3 m^2. Its relative permeability is 500. If it is wound with 250 turns. What current will be required to produce a flux of 2 x 10^-3 Wb?
18
30 sec
Q.
Two coils of inductance 8 H and 10 H are connected in parallel. If their mutual inductance is 4H, determine the equivalent inductance of the combination if mutual inductance assist the self-inductance.
19
30 sec
Q.
What is the force between two wires carrying currents 10 and 50 amperes each? The lengths of the wires are 50 cm and are separated by 5 cm distance.
20
30 sec
Q.
The magnetizing force of 1000 AT/m will produce a flux density of ___ in air.
21
30 sec
Q.
Two coupled coils, L1 = 0.8 H and L2 = 0.2 H, have a coefficient of coupling k = 0.90. Find the turns ratio N1/N2.
22
30 sec
Q.
A conductor situated at right angle to a magnetic field is carrying a current of 5A. The flux density is 2.0 T. Length of the conductor is 12 cm. What is the force on the conductor?
23
30 sec
Q.
An iron core has a cross-sectional area of 10^-3 sq. m and mean circumference of 1.0 m. The relative permeability of the material is 500 and the number of turns is 200. Determine the current required to set up a flux of 0.001 weber.
24
30 sec
Q.
Two identical coupled coils have an equivalent inductance of 100 mH when connected in series aiding and 50 mH in series opposing. What are the values of the self-inductances L1 and L2?
25
30 sec
Q.
Wire length of 50 cm is moved in the field of density 1.0 weber per square meter at a velocity of 30 meter per second. What is the emf induced if the motion is perpendicular to the field?
26
30 sec
Q.
An 80 cm long conductor is carrying a current of 3.6 amperes and is situated at right an angle to afield of flux density 0.95 Tesla. What is the force on the conductor?
27
30 sec
Q.
A coil of 1000 turns is uniformly wound on ring of non-magnetic material, the mean diameter being 0.2 meter. The cross-sectional area of the coil is 4cm^2, with a current of 2 amperes flowing, find the total flux in μWb.
28
30 sec
Q.
A circular ring of iron is wound uniformly with 1000 turns of wire. Its mean diameter is 20cm and its cross-section is 4 sq.cm. Determine the current which will produce a flux of 0.02 mWb. Assume the permeability to be 800.
29
30 sec
Q.
Two coupled coils have self-inductance L1 = 150 mH and L2 = 200 mH and a coefficient of coupling K = 50. If coil 2 has 1000 turns and i1 = 5 sin 400t, find the voltage at coil 2.
