illustrations 8 and 9 pls explain!

Dear Student
The solution/s to your 1st query has/have been provided below:


The electric field exerts a force q E on the charged particle, which always accelerates (increases the speed) the particle. The particle can never be rotated in a circle by the electric field because then the radius of the orbit will keep on increasing due to the acceleration. Hence E = 0. On the other hand magnetic field dows not change the magnitude of velocity of particle but changes its direction. 
As particle is moving in circular path means direction is changing but magnitude not hence it can be achieved when  E = 0, B≠0.

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