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An oil drop of 12 excess electrons is fi...

An oil drop of 12 excess electrons is field stationary under constant clectric field of `2.55 xx 10^(4) NC^(-1)` in Millikan's oil drop experiment. Then density of the oil is 1.26g `cm^(-3)`. Estimate the radius of the drop. `(g=9.81 ms^(-2), e=1.60 xx 10^(-19)C)`.

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(a) zero ,(b) zero (c ) 1.9 N/C
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NCERT TAMIL-ELECTRIC CHARGES AND FIELDS -EXERCISES
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  8. A uniformaly charged conducting sphere of diameter 2.4 m has a surface...

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  9. An infinite line charge produces a field of 9 xx 10^(4)N//C at a dista...

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  11. An oil drop of 12 excess electrons is field stationary under constant ...

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  16. Obtain the formula for the electric field due to a long thin wire ...

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  19. A particle of mass m and charge enters the region between the two char...

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