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A charged particle is suspended in equilibrium in a uniform vertical electric field of intensity 20000 V/m. If mass of the particle is 9.6\times 10^{-16}kg , the charge on it and excess number of electrons on the particle are respectively (g=10\, m/s^{2})

  • Option 1)

    4.8\times 10^{-19}C,3

  • Option 2)

    5.8\times 10^{-19}C,4

  • Option 3)

    3.8\times 10^{-19}C,2

  • Option 4)

    2.8\times 10^{-19}C,1

 

Answers (1)

best_answer

As we learned

Point charge -

A finite size body may behave like a Point charge if it produce an inverse square electric field.

- wherein

An isolated charged sphere behave like a Point charge at very large distance.

 

 E=9\times 10^{9}\frac{Q}{r^{2}}\Rightarrow Q=\frac{E\times r^{2}}{9\times 10^{9}}=\frac{1\times (0.1)^{2}}{9\times 10^{9}}=1.11\times 10^{-12}C

 


Option 1)

4.8\times 10^{-19}C,3

Option 2)

5.8\times 10^{-19}C,4

Option 3)

3.8\times 10^{-19}C,2

Option 4)

2.8\times 10^{-19}C,1

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Avinash

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