Answer :

The velocity of the particle is v0i. So, to construct a spiral motion we need to increase radius gradually. As magnetic field cannot do work the electric filed should increase the radius. Hence, E=E0i.


To balance the force in x direction and to make a spiral motion we need a force in y direction. Again,


To get force in y direction B must be in the z direction. i.e. B=B0k.


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