kidney
发表于 2025-3-26 21:40:17
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nurture
发表于 2025-3-27 03:09:14
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BIAS
发表于 2025-3-27 07:29:11
Electromagnetism,such as those on an electric current, or on iron filings, or on a permanent magnet. The . in which the magnetic field acts at a particular point is given by the direction in which the force would act on an isolated north-seeking pole (a N-pole) at that point. The theoretical concept of an isolated n
Sad570
发表于 2025-3-27 12:51:18
Electrostatics,e manner of figure 4.1a. The electric field is represented by imaginary lines, each of which shows the path that would be traced out by the movement of a free electric charge. The . at any point is given by the direction of the force experienced by a unit positive charge placed at that point.
横条
发表于 2025-3-27 17:31:28
Single-phase Alternating Current Circuits, ‘direction’ arrows on circuit diagrams for such quantities as voltage and current. The notation used in a.c. circuits follows the general principles laid down in chapter 1 for d.c. circuits as follows.
Free-Radical
发表于 2025-3-27 21:19:27
Complex Notation,eveloped for the representation of phase difference. If we take phasor OA of length . in figure 7.1. and turn it through 90° in an ., we say that we have . the phasor. To indicate that the phasor has rotated through 90°, we write.where j is the . Length OB is shown in bold type to indicate that it i
Decimate
发表于 2025-3-27 22:50:36
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和平
发表于 2025-3-28 06:04:32
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抱怨
发表于 2025-3-28 08:54:45
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迁移
发表于 2025-3-28 13:59:25
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