Apith ball of mass 0.2g is hung by insulated thread between plates of a capacitor of separation 8 cm.find the potential difference between plates to cause the thread to incline at an angle 150with vertical,if the charge in pith ball is equal to 10-7C.

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Tcos15=mg
Tsin15=qE
tan15=qE/mg 
but E=V/d  
tan15=qV/mgd
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