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Physics University Physical Electric Field Question 18: How to find the potential of point O? Seek detailed analysis and problem-solving process, physics masters and teachers.
The potential of a semicircle at point O: u1= ∫ dq/(4π ε 0r) = π r λ/(4π ε 0r) = λ/(4ε 0).

The potential of a straight line at point O: U2 = ∫ (r→ 2r) λ dx/(4π ε 0x) = λ LN2/(4π ε 0)

Total potential at point o:

U = U 1 + 2 U2

=λ/(4ε0)+λLN2/(2ωε0)