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A spring of spring constant 'K' is fixed...

A spring of spring constant 'K' is fixed at one end has a small block of mass m and charge q is attached at the other end. The block rests over a smooth horizontal surface. A uniform and constant magnetic field B exists normal to the plane of paper as shown in figure. An electric field `vec(E) = E_(0) hat (i)(E_(0)` is a positive constant) is switched on at `t =0` sec. The block moves on horizontal surface without ever lifting off the surface. Then the normal reaction acting on the block is :

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