The magnitude of the magnetic field at point P for a certain ...

[rmenurse]

The magnitude of the magnetic field at point P for a certain electromagnetic wave is 2.12 T. What is the magnitude of the electric field for that wave at P? (c = 3.0  108 m/s)
 
  A) 745 N/C B) 636 N/C C) 5.23 N/C D) 7.45 N/C E) 6.36 N/C

Question 2

With respect to the earth, object 1 is moving at speed 0.90 c to the right. Object 2 is moving in the same direction at speed 0.70 c with respect to object 1. How fast is object 2 moving with respect to the earth?
 
  A)
 
  0.64 c
  B)
 
  1.6 c
  C)
 
  0.16 c
  D)
 
  0.80 c
  E)
 
  0.98 c

[Ptupou85]

Answer to Question 1

B

Answer to Question 2

E