Physics #2

1. 1A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. Because of an electric field along the +y-axis, the charge particle does not change velocity. What is the sign of this particle?

   1. APositive
   2. BNegative
   3. CNone of the above choices is correct.
   4. DThe particle could be either positive or negative.
2. 2A proton is to orbit Earth at the equator using Earth's magnetic field to supply part of the necessary centripetal force. In what direction should the proton move?

   1. AUpward
   2. BNorthward
   3. CSouthward
   4. DEastward
   5. EWestward
3. 3A charged particle moves with a constant speed through a region where a uniform magnetic field is present. If the magnetic field points straight upward, the magnetic force acting on this particle will be strongest when the particle moves

   1. AStraight upward
   2. BStraight downward
   3. CIn a plane parallel to Earth's surface
   4. DUpward at an angle of 45° above the horizontal
4. 4A negatively-charged particle moves across a constant uniform magnetic field that is perpendicular to the velocity of the particle. The magnetic force on this particle

   1. ACauses the particle to speed up
   2. BCauses the particle to slow down
   3. CCauses the particle to accelerate
   4. DIs in the same direction as the particle's velocity
   5. EIs opposite the direction of the particle's velocity
5. 5When doing electron and proton questions which way does someone's right hand go?

   1. AElectron is the opposite way
   2. BProton is the same way
   3. CProton is the opposite way as the electron and the electron is the same way as the right-hand rule
6. 6A charged particle is injected into a uniform magnetic field such that its velocity vector is perpendicular to the magnetic field lines. Ignoring the particle's weight, the particle will

   1. AMove in a straight line
   2. BFollow a spiral path
   3. CMove along a parabolic path
   4. DFollow a circular path
7. 7A proton, moving in a uniform magnetic field, moves in a circle perpendicular to the field lines and takes time T for each circle. If the proton's speed tripled, what would now be its time to go around each circle?

   1. A9T
   2. B3T
   3. CT
   4. DT/3
   5. ET/9
8. 8A vertical wire carries a current straight up in a region where the magnetic field vector points toward the north. What is the direction of the magnetic force on this wire?

   1. ADownward
   2. BToward the north
   3. CToward the east
   4. DToward the west
   5. EUpward
   6. FToward the south
9. 9The maximum torque on a flat current-carrying loop occurs when the angle between the plane of the loop's area and the magnetic field vector is

   1. A0°
   2. B45°
   3. C90°
   4. D145°
10. 10Two long parallel wires placed side-by-side on a horizontal table carry identical size currents in opposite directions. The wire on your right carries current directly toward you, and the wire on your left carries current directly away from you. From your point of view, the magnetic field at a point exactly midway between the two wires

    1. APoints upward
    2. BPoints downward
    3. CPoints toward you
    4. DPoints away from you
    5. EIs zero

11. 11A long, straight, horizontal wire carries current toward the east. A proton moves toward the east alongside and just south of the wire. What is the direction of the magnetic force on the proton?

    1. AToward the north
    2. BToward the south
    3. CUpward
    4. DDownward
    5. EToward the east
12. 12A vertical wire carries a current vertically downward. To the east of this wire, the magnetic field points

    1. ANorth
    2. BSouth
    3. CEast
    4. DWest
13. 13For an electromagnetic wave in free space having an electric field of amplitude E and a magnetic field of amplitude B, the ratio of B/E is equal to

    1. Ac
    2. Bc^2
    3. C1/c
    4. D1/c^2
14. 14Except for their color, a perfectly black (absorbing) object is identical to a perfectly white (reflecting) object. If identical light falls on both of these objects, what is true about the momentum they will receive from this light?

    1. AThe black object will receive twice as much as the white object
    2. BThey will both receive the same amount
    3. CThe white object will receive twice as much as the black object
    4. DThe black object will receive four times as much as the white object
15. 15Two light beams of different frequency but the same intensity fall on a black (totally absorbing) surface, striking perpendicular to the surface. Which of the following statements are true? (There could be more than one correct choice.)

    1. AThe high-frequency beam exerts more pressure on the surface
    2. BBoth beams exert the same pressure on the surface
    3. CIf the surface were painted white (totally reflecting), the pressure on it would be less than when it was black
    4. DPainting the surface white would not affect the pressure on it due to these beams
16. 16Which one of the following sets of characteristics describes the image formed by a plane mirror?

    1. AReal and inverted
    2. BReal and upright
    3. CVirtual and upright
    4. DVirtual and inverted
    5. EVirtual and larger than the object
17. 17For convex mirrors, the image is always

    1. ASmall virtual and upright
    2. BLarge virtual and inverted
    3. CSmall real and upright
    4. DSmall real and inverted
18. 18For converging lens, F2 is on which side?

    1. AF2 is on the front side
    2. BF2 is on the back side
19. 19A convex lens has focal length f. If an object is placed at a distance between f and 2f from the lens on the principal axis, the image is located at a distance from the lens

    1. AOf 2f
    2. BBetween f and 2f
    3. COf f
    4. DThat is greater than 2f
    5. EOf infinity
20. 20A convex lens has focal length f. If an object is placed at a distance beyond 2f from the lens on the principal axis, the image is located at a distance from the lens

    1. AOf 2f
    2. Bbetween f and 2f
    3. COf f
    4. DBetween the lens and f
    5. EOf infinity
21. 21A coil lies flat on a tabletop in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

    1. AThe induced current flows counterclockwise
    2. BThe induced current flows clockwise
    3. CThere is no induced current in this coil
    4. DThe current flows clockwise initially, and then it flows counterclockwise before stopping
22. 22A coil lies flat on a level tabletop in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases

    1. ACounterclockwise
    2. BClockwise
    3. CClockwise initially, then counterclockwise before stopping
    4. DThere is no induced current in this coil
23. 23A long straight wire lies on a horizontal table and carries an ever-increasing current toward the north. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the direction of the induced current in these coils is

    1. AClockwise in both coils.
    2. BCounterclockwise in both coils
    3. CClockwise in the east coil and counterclockwise in the west coil
    4. DCounterclockwise in the east coil and clockwise in the west coil
24. 24A circular coil lies flat on a horizontal surface. A bar magnet is held above the center of the coil with its north pole pointing down. If the magnet is dropped from this position what is the direction of the induced current in the coil, as viewed from above?

    1. ACounterclockwise
    2. BClockwise
    3. CAn emf but no current is induced in the coil
    4. DThere is no current in the coil
25. 25A transformer is a device used to

    1. AIncrease or decrease a dc voltage
    2. BIncrease or decrease an ac voltage
    3. CTransform a direct current into an alternating current
    4. DTransform an alternating current into a direct current
26. 26If the secondary coil of a transformer contains more loops than the primary coil, then it is a

    1. AStep-up transformer
    2. BStep-down transformer
27. 27According to Lenz’s law, the direction of induced current in the coil is in the _________ direction when field disappears and the magnetic field points up.

    1. ACounterclockwise
    2. BClockwise
    3. CThere is no induced current
28. 28According to Lenz’s law, the direction of induced current in the coil is in the _________ direction when the field gets stronger and the magnetic field points up.

    1. AClockwise
    2. BCounterclockwise
    3. CThere is no induced current

Descrição

Physics Quiz sobre Physics #2, criado por Varun Sharma em 01-03-2020.

Autor

Varun Sharma

Idioma

English

Visualizações

1

Etiquetas

physics

Avaliação

Ainda sem avaliações

Avalie este quiz

Avalie este quiz

Mais sobre Magnetic Forces and Charged Particles