What is the net force on a magnetic dipole in a uniform magnetic field [img=14x24]1803a3749667c37.png[/img]?
A: Nonzero and in the direction of [img=14x24]1803a3749f40258.png[/img].
B: Nonzero and in the direction of [img=28x26]1803a374a7784ea.png[/img].
C: Nonzero and perpendicular to [img=14x24]1803a3749f40258.png[/img].[img=14x24]1803a3749f40258.png[/img]
D: zero.
A: Nonzero and in the direction of [img=14x24]1803a3749f40258.png[/img].
B: Nonzero and in the direction of [img=28x26]1803a374a7784ea.png[/img].
C: Nonzero and perpendicular to [img=14x24]1803a3749f40258.png[/img].[img=14x24]1803a3749f40258.png[/img]
D: zero.
举一反三
- Is there a relationship between the electric field [img=14x24]1803a376c9db0a5.png[/img] and magnetic field [img=14x24]1803a376d21ab6b.png[/img] of an electromagnetic wave at each point in vacuum? A: No any relationship. B: Yes, [img=14x24]1803a376db08c62.png[/img] is perpendicular to [img=14x24]1803a376e3d9bc3.png[/img] and [img=59x19]1803a376eca6699.png[/img]. C: Yes, [img=14x24]1803a376db08c62.png[/img] is parallel to [img=14x24]1803a376e3d9bc3.png[/img] and [img=59x19]1803a376eca6699.png[/img]. D: No relationship in direction but [img=59x19]1803a376eca6699.png[/img] in magnitude.
- 其他条件不变时，当税收增加[img=14x24]17e43c3ac2c6638.png[/img]时,IS曲线( ) 未知类型：{'options': ['左移[img=14x24]17e43c3ac2c6638.png[/img]', ' 左移[img=14x24]17e43c3ac2c6638.png[/img] X税收乘数', ' 右移[img=14x24]17e43c3ac2c6638.png[/img] X税收乘数', ' 右移。'], 'type': 102}
- 逻辑函数F=AB+[img=14x24]17e43db17bde337.jpg[/img]D，其反函数[img=12x24]17e43db184fa8ba.jpg[/img]为（ ） 未知类型：{'options': ['（A+B）（[img=14x24]17e43db18d92bfb.jpg[/img]+[img=14x24]17e43db196a9131.jpg[/img]）', ' （[img=14x24]17e43db17bde337.jpg[/img]+B）（[img=14x24]17e43db18d92bfb.jpg[/img]+D）', ' （A+[img=14x24]17e43db1a047788.jpg[/img]）（C+[img=14x24]17e43db196a9131.jpg[/img]）', ' （A+B）（C+D）'], 'type': 102}
- Electric field [img=14x24]1803a374c4e0b52.png[/img] and magnetic field [img=14x24]1803a374ccd1dcd.png[/img] are perpendicular to the particle’s velocity and to each other as shown in the figure. What is the speed that the particles must have when they leave the source for them to be able to pass through the very narrow and long field region? . (In form of / , if fraction)
- In the free space, the magnetic strength of the magnetic field of infinite plane current (excluding the thickness of the plane current) is [img=14x24]1803b72d2d865c9.png[/img]=______. A: μ0i, whose direction is the same as the current B: μ0i/2, whose direction is the same as the current C: μ0i, whose direction is perpendicular to the current D: μ0i/2, whose direction is perpendicular to the current