A charge of 5.0 pC is distributed uniformly on a spherical ...

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A charge of 5.0 pC is distributed uniformly on a spherical surface (radius = 2.0 cm), and a second charge of -2.0 pC is distributed uniformly on a concentric spherical surface (radius = 4.0 cm). Determine the magnitude of the electric field 3.0 cm from the center of the two surfaces.
 a. 30 N/C
  b. 50 N/C
  c. 40 N/C
  d. 20 N/C
  e. 70 N/C

Question 2

A 5.0-nC point charge is embedded at the center of a nonconducting sphere (radius = 2.0 cm) which has a charge of -8.0 nC distributed uniformly throughout its volume. What is the magnitude of the electric field at a point that is 1.0 cm from the center of the sphere?
 a. 1.8  105 N/C
  b. 9.0  104 N/C
  c. 3.6  105 N/C
  d. 2.7  105 N/C
  e. 7.2  105 N/C

[mistyjohnson]

Answer to Question 1

B

Answer to Question 2

C

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Gracias!

[yeungji]

Thanks for the timely response, appreciate it