Answer:
Explanation:
The direction of propagation of electromagnetic wave 
is given by the direction of vector E x B where E is electrical field , B is magnetic field . 
Given Electric field  = E i because it is along x axis 
Magnetic field = Bj because it is along y axis 
E x B = Ei x Bj 
= EB k . 
so direction of E  x B is along k direction or z  - axis so wave is propagating along z - axis . 
 
        
             
        
        
        
The magnetic particles are mixed with other substances to make it flexible.