A charged cork ball having mass 1 g and charge q is suspended on a light string in a uniform electric field as shown in figure. The ball is in equilibrium at 
, when value of electric field is 
. (Assume, T as tension in the string.) Which of the following options are correct? (Given, 
and 
).
Text Solution
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Mass of cork ball,
Force on cork ball due to electric field E
According to given diagram, equating forces in horizontal & vertical given direction,
Dividing Eqs. (i) by (ii), we get
Putting values of known quantities
Putting value of 
in Eq. (i). we get
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