• 2022-06-06 问题

    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.

    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.

  • 2022-06-07 问题

    Determine Determine which of the following statements concerning LTI systems is false. A: If h(t) is the impulse response of an LTI system and h(t) is periodic and nonzero, the system is unstable. B: If a discrete-time LTI system has an impulse response h[n] of finite duration, the system is stable C: If an LTI system is causal, it is stable D: A continuous-time LTI system is stable if and only if its impulse response h(t) is absolutely integrable.

    Determine Determine which of the following statements concerning LTI systems is false. A: If h(t) is the impulse response of an LTI system and h(t) is periodic and nonzero, the system is unstable. B: If a discrete-time LTI system has an impulse response h[n] of finite duration, the system is stable C: If an LTI system is causal, it is stable D: A continuous-time LTI system is stable if and only if its impulse response h(t) is absolutely integrable.

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