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Worksheets电流与磁场 current and magnetic field
Total questions: 12
Worksheet time: 3600secs
图示一直导线的电流方向，产生的磁场方向是
Diagram shows the current direction of a straight conductor, the direction of the generated magnetic field is
以下哪个 I 和 d 的组合产生最大的磁感应强度 B ？Which of the following combination of I and d produces greatest magnetic induction B ?
I = 10 A , d = 1 m
I = 10 A , d = 2 m
I = 20 A , d = 1 m
I = 20 A , d = 2 m
某长直螺线管长 20 cm，绕有 5000 匝线圈，当通过的电流为 10 A 时，螺线管内中轴线上的磁感应强度是多大？
A long straight solenoid is 20 cm long and has a 50-turn coil. When the current passed is 5 A, what is the magnetic induction on the central axis in the solenoid?
[ μ0=4π×10−7 T m A−1 ]
0.31 T
0.0031 T
0.063 T
0.63 T
图示一通电导线放置在两个条形磁铁中间。作用在导线的力方向是
The picture shows a straight wire with current placed between two bar magnets. The direction of the force acting on the wire is
指向磁铁 S 极
Pointing to the S pole
指向磁铁 N 极
Pointing to the N pole
向上 upwards
向下 downwards
A circular loop of wire with a diameter of 0.2 m is held at an angle 45° to a 0.5 T magnetic field. What is the magnetic flux through the loop?
直径为 0.2 m 的圆形线圈与0.5 T磁场成45°。 通过线圈的磁通量是多少？
0 Wb
0.044 Wb
0.011 Wb
0.071 Wb
两根平行的长直导线通以大小和方向相同的电流，导线之间将产生
Two parallel long straight wires are passed by currents of same magnitude and direction. The force produced between the wires will be
吸引力 attractive
排斥力 repulsive
磁感应强度为 0.5 T 的匀强磁场中有一根与磁场方向垂直的通电导线，导线长 1 m，电流强度是 10 A，导线受到的安培力是多大（单位 N）？（写出你的最终答案）
In a uniform magnetic field with a magnetic induction of 0.5 T, there is a straight wire perpendicular to the direction of the magnetic field. The wire is 1 m long with current of 10 A. Determine the magnitude of ampere force on the wire (in unit N) ? (Write your final answer)
(a)
图示一负电荷以速度 v 垂直射入匀强磁场，电荷所受洛伦兹力的方向是
As shown in the figure, a negative charge is injected perpendicularly into a uniform magnetic field at a speed v. The direction of the Lorentz force on the charge is
向上 upwards
向下 downwards
向左 to the left
向右 to the right
What is the magnitude of Lorentz force on a 0.100 μC positive charge that pass through a 1.50 T magnetic field perpendicularly at a speed of 5.00 m/s?
一 0.100μC 正电荷以 5.00 m / s 的速度垂直射入 1.50 T 的匀强磁场，电荷所受的的洛伦兹力大小是多少？
7.5×10−7 N
0.75 N
7.5×105 N
7.5×10−4 N
质量 9.1×10−31 kg 的电子以速度 1.7×107 m s−1 垂直射入 0.20 T 的匀强磁场，电子在磁场中做匀速圆周运动的轨道半径是多少？
An electron of mass 9.1×10−31 kg injected perpendicularly to a 0.20 T uniform magnetic field with speed 1.7×107 m s−1 . What is the radius of the electron's circular motion in magnetic field?
4.83×10−4 m
2.07×103 m
6.69×10−20 m
8.79×1018 m
The figure shows the paths of ions of different isotopes of an element in a mass spectrometer. Among the three isotopes, the one with greatest mass-charge ratio is
图示质谱仪中某元素中三个同位素的离子路径。 拥有最大质荷比的同位素是
a
b
c
