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24dbdd0b88
* Update coulombs_law.py distance is positive non zero real number (float type) hence corrected docs which says only integer. * Update physics/coulombs_law.py --------- Co-authored-by: Tianyi Zheng <tianyizheng02@gmail.com>
43 lines
1.1 KiB
Python
43 lines
1.1 KiB
Python
"""
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Coulomb's law states that the magnitude of the electrostatic force of attraction
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or repulsion between two point charges is directly proportional to the product
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of the magnitudes of charges and inversely proportional to the square of the
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distance between them.
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F = k * q1 * q2 / r^2
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k is Coulomb's constant and equals 1/(4π*ε0)
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q1 is charge of first body (C)
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q2 is charge of second body (C)
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r is distance between two charged bodies (m)
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Reference: https://en.wikipedia.org/wiki/Coulomb%27s_law
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"""
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def coulombs_law(q1: float, q2: float, radius: float) -> float:
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"""
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Calculate the electrostatic force of attraction or repulsion
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between two point charges
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>>> coulombs_law(15.5, 20, 15)
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12382849136.06
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>>> coulombs_law(1, 15, 5)
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5392531075.38
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>>> coulombs_law(20, -50, 15)
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-39944674632.44
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>>> coulombs_law(-5, -8, 10)
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3595020716.92
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>>> coulombs_law(50, 100, 50)
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17975103584.6
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"""
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if radius <= 0:
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raise ValueError("The radius is always a positive number")
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return round(((8.9875517923 * 10**9) * q1 * q2) / (radius**2), 2)
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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