IB Physics-ThemeD2- Electricity Qc#18-Electric field

Two equal positive fixed point charges Q = +44 μC and point P are at the vertices of an equilateral triangle of side 0.48 m. Show that the magnitude of the resultant electric field at P is 3 MN C−1.
State the direction of the resultant electric field at P.
Point P is now moved closer to the charges.
A point charge q = −2.0 μC and mass 0.25 kg is placed at P. When x is small compared to d, the magnitude of the net force on q is F ≈ 115x.
Explain why q will perform simple harmonic oscillations when it is released.
Calculate the period of oscillations of q.
Two identical positive point charges X and Y are placed 0.30 m apart on a horizontal line. O is the point midway between X and Y. The charge on X and the charge on Y is +4.0 µC.
Calculate the electric potential at O.

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