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 the paper as shown in the figure. An electric field $\to E = E_{0}^i$ ( $E_{0}$ is a positive constant) is switched on at $t = 0$ sec. The block moves on the horizontal surface without ever lifting off the surface. Where is the normal reaction acting on the block maximum?

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Solution

According to lorentz force
$\to F = q . \to V \times \to B$
So, according to right hand thumb rule force will be downward when body moves in the right direction and it will be maximum because it have maximum velocity at mean position.

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