Four greatest circular plates have been cut out from a circular plate of area 196 sq-cm. Find the circumference of each of the plates.

If the length of a half circular area is 36 cm ,then find the diameter of the circular area.

Each of the plates of a parallel plate capacitor is a circular disc of radius 5 cm. Find out its capacitance if the separation between the plates is 1 mm.

A monochromatic radiation of wavelength lamda and intensity I is incident on a plate of area A. Find the number of photons striking the plate per second.

A screw gauge has 50 circular scale divisions and a pitch of 0.1 cm. When this is used to measure the thickness of a plate the main scale reading is 0.2 cm and the circular scale reading is 35. What is the thickness of the plate?

If the height of a right circular cylinder is 14 cm and lateral surface area is 264 sq-cm, find the volume of the cylinder.

The slant height of a right circular cone is 7 cm and the total surface area of its is 147.84 sq.cm. Find the base radius of the cone.

In a parallel plate capaacitor with air between the plates, each plate has an area of 6xx10^(-3) m^2 and the distance between the plates is 3mm. Calculate the capacitance of the capacitor. If this capacitor is connected to a 100V supply, what is the charge on each plate of the capacitor?