1.

A charged bead is capable of sliding freely through a string held vertically in tension. An electric field is applied parallel to the string so that the bead stays at rest of the middle of the string. If the electric field is switched off momentarily and switched on

Answer»

the bead moves downwards and stops as soon as the field is SWITCHED on 
the bead moved downwards when the field is switched off and moves UPWARDS when the field is switched on 
the bead moves downwards with constant acceleration till it reaches the BOTTOM of the string 
the bead moves downwards with constant VELOCITY till it reaches the bottom of the string 

Answer :D


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