A wire of diameter d = 1 mm is wrapped around a cylindrical core ...

[yoroshambo]

A wire of diameter d = 1 mm is wrapped around a cylindrical core of radius R = 5 cm and length l = 30 cm to build a solenoid. What is the energy stored in this solenoid when a current I = 0.2 A passes through it?
 
  A)
 
  1.2  10-4 J
  B)
 
  9.6  10-4 J
  C)
 
  4.8  10-4 J
  D)
 
  2.4  10-4 J
  E)
 
  0.6  10-4 J

Question 2

A thin uniform spherical shell exerts zero force on a particle located inside of the thin shell.
 
  Indicate whether the statement is true or false

[diana chang]

Answer to Question 1

E

Answer to Question 2

TRUE