yeah should be d option as it depends on velocity(magnitude) by which it is projected
Yeah, it's the given answer but didn't the repulsion between the charges becomes infinite when they are just about to touch??
@pratyaksh_tyagi, please see this problem
When x\rightarrow 0 it behaves like a infinite sheet of charge
x is the distance from the center of disc
Yeah, so what should be the most appropriate answer?
See example 5 in dcp, you will understand better