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In a particular experiment, a high vltag...

In a particular experiment, a high vltage is created by charging an isolated metal sphereas shown in the fig.
The sphere has diameter 42 cm and any charge on its surface may be considered as if IT were concentrated at its centre. The air surrounding the sphere loses its insultaing properties, causing a spark, when the electric field exceeds `20 kV cm^-1` by reference to an atom in the air, suggest the mechanism by which the electric field causes the air to become conducting.

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In a particular experiment, a high voltage is created by charging an isolated metal sphere as shown in the fig. The sphere has diameter 42 cm and any charge on its surface may be considered as if it were concentrated at its center. The air surrounding the sphere loses its insulating properties, causing a spark, when the electric field exceeds 20 kV cm^-1 . Calculate for the charged sphere when a spark is about to occur the charge on the sphere and its potential.

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MODERN PUBLICATION-ELECTRIC POTENTIAL-EXERCISE
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  6. Define electric potential. What is the SI unit of potential? Obtain an...

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  7. Define electric potential at a point. Derive an expression for the pot...

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  8. Derive an expression for the electric potential at a point along the a...

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  9. Derive an expression for electric field intensity at a distance r from...

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  10. Deduce an expression for electric potential due to an electric dipole ...

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  11. Deduce an expression for electric potential due to an electric dipole ...

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  12. How is electric field at a point related to potential gradient?

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  13. How is electric field at a point related to potential gradient?

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  14. What is the shape of equipotential surfaces for a uniform electric fie...

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  15. Draw the equipotential surfaces due to an electric dipole. Locate the ...

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  16. Obtain an expression for potential energy of the configuration of thr...

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  17. Depict the equipotential surfaces for a system of two identical positi...

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  18. Deduce the expression for the potential energy of a system of two poin...

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  19. Two uniformly large parallel thin plates having charge densities +sigm...

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  20. Two point charges q1 and q2 are kept at a distance of r(12) in air. De...

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  21. Derive an expression for potential at a point due to a group of point ...

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