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Test

EP Quiz 3

Dustin Wilson 14 preguntas 5,0 (1 valoración)

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Preguntas del test (14)

  1. 1Suppose an electron e− is headed at us from outer space (a “cosmic ray”) in the direction shown. Which way will the earth’s magnetic field deflect it?Imagen de la pregunta 1
    1. ANorth
    2. BSouth
    3. CEast
    4. DWest
  2. 2Suppose a dust cloud over our heads has acquired a positive charge via friction
    and is drifting from west to east. Which way will the magnetic force act on the dust cloud, assuming earth’s magnetic field is parallel to the surface.?
    1. AUp
    2. BDown
    3. CNorth
    4. DSouth
  3. 3Which direction does the magnetic field produced by the left magnet point at the position of the right magnet? Imagen de la pregunta 3
    1. A←−
    2. B↑
    3. C−→
    4. D↓
  4. 4Which direction does the magnetic field produced by the left magnet point at the position of the right magnet? Imagen de la pregunta 4
    1. ATorque: clockwise; potential energy : positive
    2. BTorque: clockwise; potential energy : negative.
    3. CTorque: counter-clockwise; potential energy : positive.
    4. DTorque: counter-clockwise; potential energy : negative.
  5. 5Which atomic quantity predominantly determines the magnetic properties of a material?
    1. AAtomic mass
    2. BElectron angular momentum
    3. CAtomic weight
    4. DInteratomic spacing
  6. 6How could one demagnetize a piece of iron? Choose the best answer.
    1. AHeat it up
    2. BHit it several times with a hammer
    3. CEither one
    4. DNeither one
  7. 7The diagram (from Littlefuse, Inc.) above shows a solenoid that is used in an electromagnetic switch (a “relay”).. When the electrical switch at top is closed, the voltage at point 2 becomes positive while the voltage at point 3 remains at 0. Which way does the magnetic field inside
    the solenoid point?    Imagen de la pregunta 7
    1. AOut of the page
    2. Bup
    3. CInto the page
    4. DDown
  8. 8Referring to the same diagram, the upside-down T-shaped object (“plunger”) develops a sufficiently strong magnetic dipole moment after the solenoid is energized that it is pulled up into the solenoid (thus electrically connecting point 1 to point 4). After a period of repeated usage, the plunger’s dipole moment persists even with the solenoid de-energized. From this information we can deduce that the T-shaped object is made of a material that is?Imagen de la pregunta 8
    1. ADiamagnetic
    2. BNon-magnetic
    3. CFerromagnetic
    4. DParamagnetic
  9. 9The circuit above consists of a resistor with R = 120 Ω, an inductor with L = 0.1 mH, a
    battery with E=12 V, and a switch. After being open for a long time, the switch is closed.
    What are good estimates for the current in the circuit 10−9 s and 10 s after the switch is
    closed.    Imagen de la pregunta 9
    1. A10^−9 s: 0 mA; 10 s: 0 mA.
    2. B10^−9 s: 100 mA; 10 s: 0 mA.
    3. C10^−9 s: 0 mA; 10 s: 100 mA.
    4. D10^−9 s: 100 mA; 10 s: 100 mA.
  10. 10The device pictured is called a “choke”. It’s nothing more than heavy gauge wire wound into a coil. Chokes are wired in series with sensitive electronic devices, usually very close to the “front end” connector. The most likely purpose of a choke is to?Imagen de la pregunta 10
    1. APrevent large steady currents from flowing into a circuit.
    2. BAllow rapidly changing currents to pass into a circuit.
    3. CBlock slowly varying currents from entering a circuit.
    4. DKeep high frequency AC current from entering a circuit.

Información

Descripción
Engineering Test sobre EP Quiz 3, creado por Dustin Wilson el 13/12/2018.
Idioma
English
Visitas
21
Etiquetas
engineering
Valoración
5,0 de 5 · 1 valoración
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