At a distance D from a very long (essentially infinite) uniform ...

[dollx]

At a distance D from a very long (essentially infinite) uniform line of charge, the electric field strength is 1000 N/C. At what distance from the line will the field strength to be 2000 N/C?
 
  A) 2D
  B) D
  C) D/
  D) D/2
  E) D/4

Question 2

Two long straight parallel lines, 1 and 2, carry uniform positive linear charge densities. The charge density on line 2 is twice as great as the charge density on line 1. The locus of points where the electric field due to these lines is zero is
 
  A) along a line between the lines closer to line 2 than line 1.
  B) at a point midway between the lines.
  C) along a line perpendicular to lines 1 and 2.
  D) along a line between the lines closer to line 1 than line 2.

[hugthug12]

Answer to Question 1

Answer: D

Answer to Question 2

Answer: D

[dollx]

Excellent

[Dominic]

Gracias!