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Good morning sir... Answer is 3 Rd option. Explain it.

Good morning sir...
Answer is 3 Rd option. Explain it.

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1 Answers

Rohit
103 Points
5 years ago
The answer must be [(3×E×ne)/4πgp].
Explaination: As the drop is in equilibrium with the electric field we have F=W. Total charge on n electrons is ne.
Eq=mg.
         Eq= (p×v)×g.  
         Ene= 4/3πr^3 × g × p.
         Hence r =[( 3×E×ne)/4×πgp]^1/3.
Happy to help u .Approve if u r satisfied.
Regards
Rohit.
        

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