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Question

# 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 that plane of paper as shown in figure. An electric field →E=E0^i (E0 is a positive constant) is switched on at t=0sec. The block moves on horizontal surface without ever lifting off the surface. Then the normal reaction acting on the block is

A
Maximum at extreme position and minimum at mean position
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B
Maximum at mean position and minimum at extreme position
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C
is uniform throughout the motion
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D
is both maximum and minimum at mean position
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Solution

## The correct option is A Maximum at extreme position and minimum at mean positionN=mg−F→B=mg−(qVB)At extreme position- V is minimum ⇒ N is maximumAt mean position -V is maximum ⇒ N is minimum.

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