Charge is placed on the surface of a 2.7-cm radius isolated conducting sphere. the surface charge density is uniform and has the value 6.9  10-6 c/m2. the total charge on the sphere is:

First, convert the radius of the sphere from centimeter to meter.

r = (2.7 cm) (1 m / 100 cm)

r = 0.027 m

Then, calculate for the surface area of the given by the equation,

A = 4πr²

Substituting the known values,

A = 4 (π) (0.027 m) ²

A = 9.16 x 10⁻³ m²

Then, multiply the calculated area to the charge density given to determine the total charge.

C = (6.9 x 10⁻⁶ C/m²) (9.16 x 10⁻³ m²)

C = 6.32 x10⁻⁸ C

Answer: C = 6.32 x 10⁻⁸ C