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a
The minimum velocity given at the lowest point to complete vertical circular motion is lessthan 5gR for motion in gravity.
b
For any value of velocity given in horizontal direction at the lowest point in gravity free space it will perform vertical circular motion.
c
Tension in gravity free space cannot becomes zero at any point during motion.
d
If the charge at the centre is removed and considering the motion in gravity tension will also be function of charge on particle
answer is A.
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