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Drops of mercury of charge Q and mass M fall into a spherical vessel of radius 1m from a height of 4R from the base. Find the no. of drops that will enter the sphere.
Use- 9Q2Mg= 109
Edit:
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15 Answers
1I think the weight would be balanced by the electric field...but thats all I can think!!!!!!
1srry .its 10^9
edited
ok!thhen answer is not 3 ...
may be in the question we shld have 9q^2/mg = 10^-9,then only we can get an answer between 0-9.
1Found this question somewhere else...
Its given- use 9Q2Mg=10-9
Now someone try??
1nicely done...this is one of the questions which were discussed in my class.....
1Thats done well...but if we use the energy method, i.e. if we use the self energy concept, we get a different answer...plz someone try that method tooo..
24I dont think energy method will help us to find teh soln....we need t find limiting cond (when force are balanced)..so no role of energy here..
I hope u understand......
so ans is 5 only[1]
moreover Nishant sir too ahs approved it [1]