A copper ball of density 8.6 
cm is diameter is immersed in oil of density 0.8 
. If the ball remains suspended in oil in a uniform electric field of intensity 
acting in upward direction, what is the charge on the ball?
Text Solution
Verified by ExpertsThe correct answer is:
A
Apparent weight of the ball 
upthrust
dyne 
Let q be the charge on the ball. As the ball remains suspended,
apparent weight of the ball
or 
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