•45 At a given instant the currentand self-induced emf in an inductorare directed as indicated in Fig. 30-57.(a) Is the current increasing or de-creasing? (b) The induced emf is 17 V. Fig. 30-57 Problem 45.and the rate of change of the currentணis 25 kA/s; find the inductance.

Given : ε = 17 V dI/dt = 25 kA/s = 25 × 103 A/s

Answered: 45 At a given instant the current and…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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The current in a 80.0-mH inductor changes with time as i = 4.00t2 – 5.00t, where i is in amperes and t is in seconds. (a) Find the magnitude of the induced emf at t = 1.00 s. mv (b) Find the magnitude of the induced emf at t = 4.00 s. mv (c) At what time is the emf zero?
Still think that unit conversion isn't important? Here is a widely publicized, true story about how failing to convert units resulted in a huge loss. In 1998, the Mars Climate Orbiter probe crashed into the surface of Mars, instead of entering orbit. The resulting inguiry revealed that NASA navigators had been making minor course corrections in SI units, whereas the software written by the probe's makers implicitly used British units. In the United States, most scientists use Sl units, whereas most engineers use the British, or Imperial, system of units. (Interestingly, British units are not used in Britain.) For these two groups to be able to communicate to one another, unit conversions are necessary. The unit of force in the SI system is the newton (N), which is defined in terms of basic Sl units as 1 N=1 kg · m/s?. The unit of force in the British system is the pound (lb), which is defined in terms of the slug (British unit of mass), foot (ft), and second (s) as 1 lb =1 slug ·…
Assume an inductor with inductance L through which passes a current varying as a function of time as follows: I(t) = 15²-47 t At what time does the induced fem reach a value of zero? a) t = 3.1333 s b) t= 1.5667 s c) t = 6.2667 s d) t = 0.6383 s

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45 At a given instant the current and self-induced emf in an inductor are directed as indicated in Fig. 30-57. (a) Is the current increasing or de- creasing? (b) The induced emf is 17 V, and the rate of change of the current is 25 kA/s; find the inductance. . Fig. 30-57 Problem 45.