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20 November, 07:17

Suppose that 3.00 g of hydrogen is separated into electrons and protons. Suppose also that the protons are placed at the Earth's North Pole and the electrons are placed at the South Pole. What is the resulting compressional force on the Earth?

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  1. 20 November, 10:10
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    Atomic mass of hydrogen is 1. so 1 g of hydrogen will have 6.02 x 10²³ atoms

    3 g of hydrogen will have 3 x 6.02 x 10²³ atoms. This will give 3 x 6.02 x 10²³ protons and same number of electrons

    So number of protons at north pole = 3 x 6.02 x 10²³

    charge on these protons = 1.6 x 10⁻¹⁹ x 3 x 6.02 x 10²³ C

    = 28.9 x 10⁴ C

    similarly total charge on electrons at south pole = 28.9 x 10⁴ C

    distance between them = diameter of the earth = 2 x 6356 x 10³ m

    = 12712 x 10³ m

    Attractive force between these charges

    = k q₁q₂ / r², q₁, q₂ are charges and r is distance between charges.

    = 9 x 10⁹ x (28.9 x 10⁴) ² / (12712 x 10³) ²

    = 4.6517 x 10⁻⁵ x 10¹¹

    = 4.6517 x 10⁶ N
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