Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 37, Problem 4SQ
To determine
Choose the correct option that would not cause the following problem: when the tank is overflowing, the wound rotor motor has not started and the alarm has not sounded.
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A rod coincident with the z-axis extends from 0 to -L. If the rod carries a uniform charge density of pL (a) calculate the electric field intensity at a point h on the z-axis. (b) Use your answer to show that when h>>L the rod behaves as a point charge of value plL . (c) How much larger than the length of the rod must h be in order that the answer to part b) is a reasonably accurate estimate.
The separation of two point charges with charges Q1=36pC and ,Q2=9pC respectively, is 3 cm. If a third point charge Q3 is placed on the line joining Q1 and Q2 at a distance d from Q1 find Q3 and d that ensures that the force on all charges is zero.
5. The electric field on the positive z-axis due to a uniformly charged disk of radius a that lies in the
x-y plane with center at the origin is claimed to be given by
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Z
2E
2
a² + z²
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large the formula reduces to that of an infinite plane.
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Electric Motor Control
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