A metal sphere of radius 10 cm carries an excess charge of +2.0 ...

[segrsyd]

A metal sphere of radius 10 cm carries an excess charge of +2.0 C. What is the magnitude of the electric field 5.0 cm above the sphere's surface? (k = 1/40 = 9.0  109 N  m2/C2 )
 
  A) 4.0  105 N/C
  B) 8.0  107 N/C
  C) 4.0  107 N/C
  D) 8.0  105 N/C
  E) 4.0  109 N/C

Question 2

An object is placed 9.5 cm in front of a convex lens with a focal length of magnitude 24 cm.
  (a) Where is the image formed and how far is it from the lens?
  (b) What is the magnification produced by the lens?
 
  What will be an ideal response?

[wtf444]

Answer to Question 1

D

Answer to Question 2

(a) 16 cm in front of the lens (b) 1.7

[segrsyd]

Wow, this really help

[olderstudent]

Excellent