insulating sphere has a uniform volume charge density of 70 nC/m³, and has a radius of 8 cm. What is the potential difference between the ter of the sphere and a point 6 cm away? State only the magnitude of the potential difference.

How much velocity would be required for a proton (radius 1.2 × 10−15 m) starting at infinity to just “touch” a silicon nucleus? A silicon nucleus has a charge of +14e and its radius is about 3.6 × 10−15 m. Assumethe potential of the silicon atom can be represented as a point charge.

Consider a cylindrical condenser where between the concentric surfaces a dielectric with relative permittivity epsilon_r = (r/a)^2. The inner surface has radius a = 2.3 cm, the surfaces exterior has radius b = 8.1 cm and length L =6.4cm. The surface interior has charge q = 2.7 x 10^(-3) C and the exterior surface is connected the land.   Calculate the potential difference between the condenser surfaces in SI units?

Two point charges, A & B (qA =-80 μС & qв = 736 μC), are separated by an unknown distance. The distance between A & P is 28 cm. The potential at point P (see below) is zero. Determine the distance between A & B. P A B + 28 cm ? distance between A & B = -0.0003198 C × Dimensionally incorrect. Please check the type or dimension of your unit.