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.
Question 2
A 15-F air-filled capacitor is connected to a 50-V voltage source and becomes fully charged. The voltage source is then removed and a slab of dielectric that completely fills the space between the plates is inserted.
The dielectric has a dielectric constant of 5.0. (a) What is the capacitance of the capacitor after the slab has been inserted? (b) What is the potential difference across the plates of the capacitor after the slab has been inserted?
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