A uniformly charged ring of radius math xmlns=http://www.w3.org/199...
A uniformly charged ring of radius math xmlns=http://www.w3.org/1998/Math/MathMLmn3/mnmia/mi/math and total charge math xmlns=http://www.w3.org/1998/Math/MathMLmiq/mi/math is placed in math xmlns=http://www.w3.org/1998/Math/MathMLmix/mimiy/mi/math-plane centered at origin. A point charge math xmlns=http://www.w3.org/1998/Math/MathMLmiq/mi/math is moving towards the ring along the math xmlns=http://www.w3.org/1998/Math/MathMLmiz/mi/math-axis and has speed math xmlns=http://www.w3.org/1998/Math/MathMLmiv/mi/math at math xmlns=http://www.w3.org/1998/Math/MathMLmiz/mimo=/momn4/mnmia/mi/math. The minimum value of math xmlns=http://www.w3.org/1998/Math/MathMLmiv/mi/math such that it crosses the origin is
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