An oil drop is found floating freely between thr plates of a parallel plate condenser, the plates being horizontal and the lower plate carrying a char
An oil drop is found floating freely between thr plates of a parallel plate condenser, the plates being horizontal and the lower plate carrying a charge + Q. The area of each plate is A and the distance of separation between them is D. The charge on oil drop must be (g is acceleration due to gravity)
A. `(mgin_(0))/Q`
B. `(mgin_(0)A)/Q`
C. `(mgin_(0)A^(2))/Q`
D. `(mgin_(0)A)/(Q^(2))`
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Correct Answer - B
The wt. of oil drop is balanced by force i.e. mg = Eq
`therefore" "q=(mg)/E=(mgin_(0))/sigma=(mgin_(0)A)/Q`
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