electrical-engineering-magnetism-and-electromagnetism Related Question Answers
1. What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m2, and a permeability of 4,500 Wb/At × m?
2. A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will
3. What is the flux density when the flux is 5.5 Wb and the cross-sectional area is 6 × 10–3 m2?
5. If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet's air gap, the induced voltage
6. There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 Wb?
7. A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?
8. What is the flux density in a magnetic field in which the flux in 0.1 m2 is 600 Wb?
10. What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?
11. The direction of a magnetic field within a magnet is
12. When the north poles of two bar magnets are brought close together, there will be
13. The ability of a material to remain magnetized after removal of the magnetizing force is known as
14. The voltage induced across a certain coil is 200 mV. A 120 resistor is connected to the coil terminals. The induced current is
15. The induced voltage across a stationary conductor in a stationary magnetic field is
16. An electromagnetic field exists only when there is
17. When a solenoid is activated, the force that moves the plunger is
18. What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?
19. If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage
22. Hysteresis is the number of lines of force per unit area in a magnetic field.
23. If a conductor is moved back and forth at a constant rate in a constant magnetic field, the voltage in the conductor will reverse polarity.
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