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tellmesomething

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- Homework Statement
- A block of charge q and mass m is kept on a smooth non conducting hemisphere . When it was released from rest it was found to lose contact either the hemisphere when the angle with the vertical was 37°. find mg/qE

The electric field is perpendicular to the gravity

- Relevant Equations
- None

Firstly I drew the FBD of the said block at an angle theta from the vertical

Which force causes the block to lose contact.ie the normal to become zero...

Is it because the forces in the horizontal direction surpass some limit value of the net force in the radial direction...? I find this very confusing

I understand that the net force in the vertical direction would not be equal to zero when the block is in contact with the hemisphere....if it were 0 then the block would move in a straight line tangent to any point on the hemisphere....This net force is centripetal Force

Mathematically when the normal force equals zero the sum of the vertical forces would equal to the centripetal force..

But physically I cannot visualise it...its all very confusing... Is there a way I can back tract from the last equation, sum of vertical forces equals the net force m×a and find out a to be v²/r......?

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