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A paisa coin is made up of Al-Mg alloy a...

A paisa coin is made up of Al-Mg alloy and weights 0.75g. It has a square shape and its diagonal measures 17 mm. it is electrically neutral and contains equal amounts of positive and negative charges.
Treating the paisa coins made up of only Al, find the magnitude of equal number of positively and negatively charages. what conclusion do you draw from this magnitude?

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Consider a coin. It is electrically neutral and contains equal amounts of positive and negative charge of magnitude 34.8 kC . Suppose that these equal charages were concentrated two point charges separated by 10^6 , (radius of the earth). find the force on each such point charge. What do you conclude from these results?

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MODERN PUBLICATION-TEXUAL QUESTIONS -EXERCISE
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  20. The unit of permittivity of free space (E0) is :

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