A)
B)
C)
D)
Correct Answer: D
Solution :
Key Idea: Speed of body at highest point is zero. From equation of motion, we have \[{{Q}^{2}}/(2\pi {{\varepsilon }_{0}}{{a}^{2}})\] when \[2\mu F\] As ball is thrown upwards velocity decreases as height decreases. At the highest point velocity is zero after that body starts downward motion, its speed increases.
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