At a distance r1 from a point charge, the magnitude of the electric field created by the charge is 339 N/C. At a distance r2 from the charge, the field has a magnitude of 127 N/C. Find the ratio r2/r1

The figure gives the magnitude of the electric field inside and outside a sphere with a positive charge distributed uniformly throughout its volume. The scale of the vertical axis is set by E = 5.8 × 107 N/C. What is the charge on the sphere? 8 16 r(cm) Number i Units E (107 N/C)

A charge of –25 µC is distributed uniformly over the surface of a spherical conductor of radius 11.0 cm. Determine the electric field (in N/C) due to this charge at the following distances from the center of the sphere. (Enter the radial component of the electric field.) (a) 7.0 cm E - (0 = (b) 8.0 cm E = (c) 22.0 cm E = X N/C f

6. A solid non-conducting sphere of radius a= 4 cm has a uniformly distributed volumetric charge density p+= 3 nC/m³. It is surrounded by a non-conducting concentric spherical shell of internal radius b= 10 cm and external radius c= 13 cm, which has a uniformly distributed volumetric charge density p-=-3 nC/m³. +p Calculate the magnitude of the electric field for r= 1 cm. a) E= 8.6629 N/C b) E= 0.565 N/C c) E= 1.1299 N/C d) E= 0.4237 N/C

In the figure, a point charge 2.5 C is a distance d/2 directly above the center of a square of side 4.0 mm. What is the magnitude of the electric flux through the square?

In the figure a butterfly net is in a uniform electric field of magnitude E = 3.2 mN/C. The rim, a circle of radius a = 7.2 cm, is aligned perpendicular to the field. The net contains no net charge. Find the magnitude of the electric flux through the netting. Number i Units