Question
Physics Question on Electric charges and fields
In an oil drop experiment, 'n' numbers of electrons are stripped from an oil drop to make it positively charged. A vertical electric field of magnitude 4.9x1014 N/C is applied to balance the force due to gravity on the oil drop. If the mass of oil drop is 80 μg,the value of 'n' will be:(Take g =9.8 m/s2 and charge of an electron = 1.6 x 10-19 C)
A
1
B
10
C
100
D
1000
E
10000
Answer
10
Explanation
Solution
The correct answer is (B):10