Walker, Halliday & Resnick — Electric Potential: Problem 3

3 The thin plastic rod shown in Fig. 24-24 has length \( L = 24.0\text{ cm} \) and a nonuniform linear charge density \( \lambda = cx \), where \( c = 28.9\text{ pC/m}^2 \). With \( V = 0 \) at infinity, find the electric potential at point \( P_1 \) on the axis, at distance \( d = 3.00\text{ cm} \) from one end.