44、一带电粒子与磁感应线成任意角度射入匀强磁场,则它作___运动; If the electric particle and the magnetic induction line are injected into the uniform magnetic field at any Angle, it will do ___ 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.(D)螺线; spiral;
第1题:
Deviation is the angle between the ______.
A.true meridian and the axis of the compass card
B.true meridian and the magnetic meridian
C.magnetic meridian and the axis of the compass card
D.axis of the compass card and the degaussing meridian
第2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
第3题:
磁场(magnetic field)
第4题:
沿着电场线方向飞入匀强电场,电场力做功,动能增加
沿着磁感线方向飞入匀强磁场,磁场力做功,动能增加
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
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
第5题:
Compass error and variation are equal
Compass north will be true north
Variation will equal deviation
There will be no compass error
第6题:
degaussed
demagnetized
soaked
sandblasted
第7题:
the compass will become useless
man and animals will be confused as to directions
the magnetic strength of the Earth will disappear
the magnetic strength of the Earth will be stronger
第8题:
geographic pole and the magnetic pole
lubber's line and true north
horizontal and the magnetic line of force
compass heading and the magnetic heading
第9题:
动能不变
做匀速直线运动
速度不变
加速度不变
第10题:
like magnetic poles attract
unlike magnetic poles repel
unlike poles attract
the poles of the compass line up with the geographic poles of the earth
第11题:
第12题:
anchor chain
wire rope
connecting links
pendant wires
第13题:
If a magnetic compass is not affected by any magnetic field other than the Earth’s which statement is TRUE?______.
A.Compass error and variation are equal
B.Compass north will be true north
C.Variation will equal deviation
D.There will be no compass error
第14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()。
第15题:
磁异常(magnetic anomaly)
第16题:
第17题:
voltage
current
power
frequency
第18题:
deviation
variation
compass error
dip
第19题:
needles are nearly in line with the meridian
vessel is near the magnetic poles
variation is near zero
vessel is near the magnetic equator
第20题:
we should not worry about the transition of the Earth’s magnetic field
the Earth’s magnetic field will not change for at least 2000 years
the Earth’s magnetic field has decreased its strength rapidly
the transition of the Earth’s magnetic field can be controlled by modern science
第21题:
used to do mechanical work
used to establish the magnetic field of the motor
lost as heat generated by the windings
lost in doing work to turn the motor itself
第22题:
An agonic line
The magnetic equator
A magnetic meridian
All of the above
第23题:
operation of electrical equipment and generators on board ship
the earth's magnetic field affecting the ship's hard iron during construction
the horizontal component of the earth's magnetic field acting on the horizontal soft iron
the vertical component of the earth's magnetic field acting on the vertical soft iron
第24题:
elevation
magnetic angle
vertical angle
dip