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一带电粒子垂直磁感应线射入匀强磁场,则它作___运动; With the electric particle vertical magnetic induction line into the uniform magnetic field, it makes ___motion;A.直线; straight lines;B.变速率圆周; speed change rate of the circumference;C.匀速率圆周; uniform speed of the circumference;D.

题目

一带电粒子垂直磁感应线射入匀强磁场,则它作___运动; With the electric particle vertical magnetic induction line into the uniform magnetic field, it makes ___motion;

A.直线; straight lines;

B.变速率圆周; speed change rate of the circumference;

C.匀速率圆周; uniform speed of the circumference;

D.螺线; spiral;


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  • 第1题:

    Magnetic dip is a measurement of the angle between the ______.

    A.geographic pole and the magnetic pole

    B.lubber’s line and true north

    C.horizontal and the magnetic line of force

    D.compass heading and the magnetic heading


    正确答案:C
    磁倾角是地平和磁力线夹角的测量。

  • 第2题:

    磁场(magnetic field)


    正确答案: 地球周围存在着磁场,称为地磁场(geomagnetic field)。

  • 第3题:

    以一定速度v运动的带电粒子垂直进入匀强磁场B中最一般的运动形式是()。

    • A、圆周运动
    • B、直线运动
    • C、椭圆运动
    • D、螺旋运动

    正确答案:A

  • 第4题:

    单选题
    The magnetic compass magnets are acted on by the horizontal component of the Earth’s total magnetic force. This magnetic force is GREATEST at the().
    A

    north magnetic pole

    B

    south magnetic pole

    C

    magnetic prime vertical meridian

    D

    magnetic equator


    正确答案: D
    解析: 暂无解析

  • 第5题:

    单选题
    The coil of wire rotating in the magnetic field produces the().
    A

    voltage

    B

    current

    C

    power

    D

    frequency


    正确答案: A
    解析: 暂无解析

  • 第6题:

    单选题
    The horizontal angle between the magnetic meridian and the north-south line of the magnetic compass is().
    A

    deviation

    B

    variation

    C

    compass error

    D

    dip


    正确答案: C
    解析: 暂无解析

  • 第7题:

    单选题
    During the transition of the Earth’s magnetic field _____.
    A

    the compass will become useless

    B

    man and animals will be confused as to directions

    C

    the magnetic strength of the Earth will disappear

    D

    the magnetic strength of the Earth will be stronger


    正确答案: A
    解析:
    第三段第四句开始:磁场的转换给人类和动物带来许多问题。宇航员和卫星会遇到很多困难,依靠磁场指示方向迁徙的鸟类、鱼类和其他动物会在迁徙中失去方向。

  • 第8题:

    单选题
    Magnetic dip is a measurement of the angle between the().
    A

    geographic pole and the magnetic pole

    B

    lubber's line and true north

    C

    horizontal and the magnetic line of force

    D

    compass heading and the magnetic heading


    正确答案: D
    解析: 暂无解析

  • 第9题:

    单选题
    带电粒子以一定速度垂直射入匀强磁场,若只考虑洛伦磁力,则粒子一定()。
    A

    动能不变

    B

    做匀速直线运动

    C

    速度不变

    D

    加速度不变


    正确答案: C
    解析: 暂无解析

  • 第10题:

    单选题
    The line which connects the points of zero magnetic dip is().
    A

    An agonic line

    B

    The magnetic equator

    C

    A magnetic meridian

    D

    All of the above


    正确答案: B
    解析: 暂无解析

  • 第11题:

    单选题
    Permanent magnetism is caused by().
    A

    operation of electrical equipment and generators on board ship

    B

    the earth's magnetic field affecting the ship's hard iron during construction

    C

    the horizontal component of the earth's magnetic field acting on the horizontal soft iron

    D

    the vertical component of the earth's magnetic field acting on the vertical soft iron


    正确答案: D
    解析: 暂无解析

  • 第12题:

    单选题
    The vertical angle between the horizontal and the magnetic line of force is the().
    A

    elevation

    B

    magnetic angle

    C

    vertical angle

    D

    dip


    正确答案: C
    解析: 暂无解析

  • 第13题:

    带电粒子以一定速度垂直射入匀强磁场,若只考虑洛伦磁力,则粒子一定()。

    • A、动能不变
    • B、做匀速直线运动
    • C、速度不变
    • D、加速度不变

    正确答案:A

  • 第14题:

    磁异常(magnetic anomaly)


    正确答案: 地球浅部具磁性物质引起的局部异常。

  • 第15题:

    单选题
    关于带电粒子的运动,下面各种说法中,正确的是(  ).
    A

    沿着电场线方向飞入匀强电场,电场力做功,动能增加

    B

    沿着磁感线方向飞入匀强磁场,磁场力做功,动能增加

    C

    垂直电场线方向飞入匀强电场,在电场中运动,电场力不做功

    D

    垂直磁感线方向飞入匀强磁场,在磁场中运动,磁场力不做功


    正确答案: D
    解析:
    A项,沿着电场线方向飞入匀强电场,若该粒子带负电荷,则沿着电场线的方向动能先减少后增加;B项,沿着磁感线方向飞入匀强磁场,由于磁场力的方向始终与粒子运动方向垂直,故磁场力始终不做功;C项,垂直电场线方向飞入匀强电场,粒子运动的速度方向改变,大小会增大,电场力对粒子做正功;D项,粒子在磁场中运动,洛伦兹力方向始终与粒子运动方向垂直,故磁场力不做功.

  • 第16题:

    名词解释题
    磁场(magnetic field)

    正确答案: 地球周围存在着磁场,称为地磁场(geomagnetic field)。
    解析: 暂无解析

  • 第17题:

    单选题
    Prior to magnetic particle inspection of anchor chain,the chain should be().
    A

    degaussed

    B

    demagnetized

    C

    soaked

    D

    sandblasted


    正确答案: B
    解析: 暂无解析

  • 第18题:

    单选题
    The vertical component of the Earth’s magnetic field causes induced magnetism in vertical soft iron. This changes with latitude. What corrects for this coefficient of the deviation? ()
    A

    The Flinders bar

    B

    The heeling magnet

    C

    Quadrantal soft iron spheres

    D

    Bar magnets in the binnacle


    正确答案: C
    解析: 暂无解析

  • 第19题:

    单选题
    The greatest directive force is exerted on the magnetic compass when the().
    A

    needles are nearly in line with the meridian

    B

    vessel is near the magnetic poles

    C

    variation is near zero

    D

    vessel is near the magnetic equator


    正确答案: A
    解析: 暂无解析

  • 第20题:

    单选题
    According to the passage, _____.
    A

    we should not worry about the transition of the Earth’s magnetic field

    B

    the Earth’s magnetic field will not change for at least 2000 years

    C

    the Earth’s magnetic field has decreased its strength rapidly

    D

    the transition of the Earth’s magnetic field can be controlled by modern science


    正确答案: C
    解析:
    第五段一开始:无论新的研究发现什么,公众也不必为此惊慌。即使是磁场转移已经开始,它可能需要2000年才能完成。

  • 第21题:

    单选题
    The magnetic compass operates on the principle that().
    A

    like magnetic poles attract

    B

    unlike magnetic poles repel

    C

    unlike poles attract

    D

    the poles of the compass line up with the geographic poles of the earth


    正确答案: D
    解析: 暂无解析

  • 第22题:

    填空题
    带电粒子以速度v0平行磁感线射入匀强磁场,将做____运动;带电粒子以速度v0垂直磁感线方向射入匀强磁场,将作____运动.

    正确答案: 匀速直线,匀速圆周
    解析:
    若平行射入匀强磁场,则该粒子在磁场中不受到洛伦兹力的作用,在无外力作用下故作匀速直线运动;若垂直于磁感线方向射入匀强磁场,则始终受到一个大小恒定且方向与粒子运动方向垂直的洛伦兹力的作用,故粒子做匀速圆周运动.

  • 第23题:

    单选题
    The American Petroleum Institute recommends magnetic particle inspection for().
    A

    anchor chain

    B

    wire rope

    C

    connecting links

    D

    pendant wires


    正确答案: A
    解析: 暂无解析

  • 第24题:

    单选题
    At the magnetic equator there is no induced magnetism in the vertical soft iron because().
    A

    the lines of force cross the equator on a 0°-180°alignment

    B

    the quadrantal error is 0°

    C

    there is no vertical component of the Earth's magnetic field

    D

    the intercardinal headings have less than 1°


    正确答案: A
    解析: 暂无解析