A metal cylinder of radius 2.0 mm is concentric with another ...

[ARLKQ]

A metal cylinder of radius 2.0 mm is concentric with another metal cylinder of radius 5.0 mm. If the space between the cylinders is filled with air and the length of the cylinders is 50 cm, the capacitance of the arrangement is
 
  A)
 
  33 pF.
  B)
 
  60 pF.
  C)
 
  22 pF.
  D)
 
  30 pF.
  E)
 
  11 pF.

Question 2

Two children are riding on a merry-go-round. Child A is at a greater distance from the axis of rotation than child B. Which child has the larger angular speed?
 
  A)
 
  Child A
  B)
 
  Child B
  C)
 
  They have the same zero angular speed.
  D)
 
  They have the same non-zero angular speed.
  E)
 
  There is not enough information given to answer the question.

[xiaomengxian]

Answer to Question 1

D

Answer to Question 2

D

[ARLKQ]

Gracias!

[blakcmamba]

Thanks for the timely response, appreciate it