University:
Amherst College
Course:
PHYS 117 | Introductory Physics II: Electromagnetism and Optics
Academic year:

2020
Views:

361

Pages:

7
Author:

acocolesm9s

Which of the following statements about electric field lines is not true? 1) 2) 3) 4) 5) The number of lines leaving a positive charge or entering a negative charge is proportional to the charge. The lines begin on positive charges and end on negative charges. The density of the lines (the number per unit area perpendicular to the lines) is proportional to the magnitude of the field at that point. Electric field lines cross midway between charges that have equal magnitude and sign. The direction of each line indicates the direction that a positively charged particle would start to move if placed at that point. The electric field directly above the center of a uniformly charged, positive horizontal line segment points 1) 2) 3) 4) 5) Up Down Left Right None of the above. P Finding the Electric Field due to Continuous Charge Distributions • When possible, use symmetry to eliminate one or more component of the electric field. • Define a (linear, areal or volume) density to relate small spatial regions to small bits of charge. • Calculate the electric field due to each small k dq charge bit: dE  r . • Sum up (integrate) the electric fields to find the total field. 2 Electric Field due to a very long, uniformly charged line • Linear charge density: Charge per unit length Q  L Electric Field distance dependence • Point charge: E  kr q • Uniformly charged Line: • Uniformly charged Sheet: 2 E 2k  R E  2ks  s  areal charge density (charge per unit area)

Which of the Following Statements about Electric Field Lines is not True

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