Acurrent exists whenever electric charges move. if δq is the net charge that passes through a surface during a time period δt, then the average current during this time interval is defined asaverage current = δqδt = q2 − q1t2 − t1.if we take the limit of this average current over smaller and smaller time intervals, we get what is called the current i at a given time t1: i = lim δt→0 δqδt = dqdt. thus the current is the rate at which charge flows through a surface. the current in a wire is defined as the derivative of the charge: i(t) = q'(t). what does bi(t)a dt represent?
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Physics, 21.06.2019 22:50
Moon effect. some people believe that the moon controls their activities. if the moon moves from being directly on the opposite side of earth from you to being directly overhead, by what percentage does (a) the moon's gravitational pull on you increase and (b) your weight (as measured on a scale) decrease? assume that the earth–moon (center-to-center) distance is 3.82 × 10^8 m, earth's radius is 6.37 × 10^6 m, moon's mass is 7.36 × 10^22 kg, and earth's mass is 5.98 × 10^24 kg.
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Physics, 22.06.2019 10:00
Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?
Answers: 1
Physics, 22.06.2019 10:30
Find the magnetic field a distance r from the center of a long wire that has radius a and carries a uniform current per unit area j in the positive z direction.
Answers: 2
Acurrent exists whenever electric charges move. if δq is the net charge that passes through a surfac...
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