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电场线处处平行的区域为什么是匀强电场? Why is the area where the Electric Field Line is parallel everywhere Uniform Electric Field?
A.利用高斯定理可以证明同一电场线各点的电场强度相等;利用静电场环路定理可以证明不同电场线上的场 强相等,故电场线处处平行的区域一定是匀强电场; It can be proved that the Electric Field Intensity of each point of the same Electric Field Line is equal by using Gauss Theorem, and the Electric Field Intensity of different Electric Field Lines is equal by using Electrostatic Field Loop Theorem, so the area where the Electric Field Lines are parallel everywhere must be Uniform Electric Field;#B.利用高斯定理可以证明同一电场线各点的电参考答案和解析
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更多 “电场线处处平行的区域为什么是匀强电场? Why is the area where the Electric Field Line is parallel everywhere Uniform Electric Field?A.利用高斯定理可以证明同一电场线各点的电场强度相等;利用静电场环路定理可以证明不同电场线上的场 强相等,故电场线处处平行的区域一定是匀强电场; It can be proved that the Electric Field Intensity of each point of the same Electric Field Line is equal by using Gauss Theorem, and the Electric Field Intensity of different Electric Field Lines is equal by using Electrostatic Field Loop Theorem, so the area where the Electric Field Lines are parallel everywhere must be Uniform Electric Field;#B.利用高斯定理可以证明同一电场线各点的电” 相关考题
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An electric heater draws 10 A from a 120V line. The resistance of the heater is _____.
A、1200?B、120?C、12?D、1.2?
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此题为判断题(对,错)。
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In an AC.synchronous motor electric propulsion plant,propeller speed is controlled by()
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Yuri created a formula for a button. The code is supposed to set the value of an existing field called title. He used the following formula: title:= @propercase (title); after the foumula runs ,the title field is null. Why? ()A、the value of one field cannot be set from the value in another field B、the text string in the formula is set to null. Thus notes cannot validate the formula C、when setting the value of a field , the formula must be in the field‟s input validation event D、the formula does not specify that title is an existing field. Thus it is interpreted as a temporary variable
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关于电场线,以下说法正确的是()A、电场线上各点的电场强度大小相等B、电场线是一条曲线,曲线上的每一点的切线方向都与该点的电场强度方向平行C、开始时处于静止的电荷在电场力的作用下运动的轨迹必与一条电场线重合D、在无电荷的电场空间,电场线可以相交
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when robert created a response form. he set the "formulas inherit values from selected document" option on the form properties, the field name on the review form is the same as the field name on the inheriting form, however the form does not inherit any data ,why ?()A、he failed to specify the form type B、the inheriting form is not a response form C、he specified the same field names on both forms D、he failed to provide inheritance formulas for each field
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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
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单选题操作完后,关掉电动机。()A
After operation, start the electric motor.B
Before operation, stop the electric motor.C
Before operation, start the electric motor.D
After operation, stop the electric motor.
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单选题在匀强电场中( ).A
电势高处电场强度大B
负电荷沿电场线方向移动时电势升高C
电势高的地方和电势低的地方,电场强度相同D
电荷垂直于电场线方向进入电场后,电荷不受电场力的作用
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单选题Why did the electric fence fail? It is because of _____.A
The deer are smartB
The winter is coldC
The fence is of low qualityD
Snowpack serves as an insulator
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单选题when robert created a response form. he set the "formulas inherit values from selected document" option on the form properties, the field name on the review form is the same as the field name on the inheriting form, however the form does not inherit any data ,why ?()A
he failed to specify the form type B
the inheriting form is not a response form C
he specified the same field names on both forms D
he failed to provide inheritance formulas for each field
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单选题If the electric motor driving an air compressor fails to start, the cause may be a ().A
leaking unloaderB
tripped circuit breakerC
control line leakD
defective pop valve
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单选题When there is a fire in a large electric motor, normally the very FIRST step is to ()A
secure the electric supplyB
ventilate area to remove smokeC
start the fire pump and lead out hoseD
apply foam
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单选题Yuri created a formula for a button. The code is supposed to set the value of an existing field called title. He used the following formula: title:= @propercase (title); after the foumula runs ,the title field is null. Why? ()A
the value of one field cannot be set from the value in another field B
the text string in the formula is set to null. Thus notes cannot validate the formula C
when setting the value of a field , the formula must be in the field‟s input validation event D
the formula does not specify that title is an existing field. Thus it is interpreted as a temporary variable
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单选题Who was the most famous of all American inventors and invented electric lamp, phonograph, motion pictures and parallel circuit?A
John StevensB
Alexander Graham BellC
Thomas Alva EdisonD
John H. Hall
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单选题Field of view( FOV) relates to the ( )A
diameter of the patient apenure of the imagerB
maximum diameter of the patientC
diameter of the area that isreconstructedD
the diameter of a pixel
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单选题If two AC generators are operated in parallel, the load is distributed evenly by()A
a rheostatB
a balancing coilC
changing field excitationD
adjusting the governor settings
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单选题As a general rule, the first troubleshooting action to be taken in checking faulty electric control devices is to ().A
draw a one line diagram of the circuitryB
test all fuses and measure the line voltageC
take megger readingsD
insulate the apparatus from ground
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单选题Prior to any overhaul work on electric equipment, it is important to ensure the circuits are ().A
liveB
deadC
excitedD
on line
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单选题What type of electric motor is most commonly used on board ship?()A
non-synchronous electric motorB
synchronous electric motorC
fully enclosed electric motorD
watertight electric motor
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单选题The resistance of electric wire will decrease as its ()A
length increasesB
cross-sectional area increasesC
temperature increasesD
percent of metallic purities increases
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