An air capacitor has plates of 6 cm diameter. At what distance should the plates be placed so as to have the same capacitance as a sphere of diameter of 90 cm?

At what distance should the two plates each of surface are 0.2 m xx 0.1m of an air capacitor be placed in order to have the same capacitance as a spherical conductor of radius 0-5 m?

An air capacitor has an area of 1,000 cm^2 and the two plates are 4 mm apart. It is connected in series with another capacitor having a plate ares of 20 cm^2 , the plates being separated by a dielectric 0.1 mm thick having dielectric constant o 2.5 . If the potential difference across the second capacitor is 100 V, find the voltage applied across the series combination.

A concave lens has focal length of 15 cm. At what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens? Also find the magnification produced by the lens.

A parallel plate capacitor has each plate of 0.06 m diameter separated by 0.05 cm of air. What is the capacitance of the capacitor? What would be the radius of a sphere having the same caapcitance?

A convex lens of power 4D is placed at a distance of 40 cm from a wall at what distance from the lens should a candle be placed so that its image is formed on the wall?

Find the volume and the surface area of a metallic sphere having diameter 8.4 cm

In a parallel plate capacitor with air between the plates, each plate has an area of 6 xx 10^-3 m^2 and the distance between the plates is 3 mm. Calculate the capacitance of the capacitor. If this capacitor is connected to a 100 V supply, what is the charge on each plate of the capacitor?

What is the area of the plates of a 2F parallel plate capacitor given that te separation between the plates is 0.5 cm ?

A parallel plate capacitor of capacitance C is charged to a potential V. It is then connected to another uncharged capacitor having the same capacitance. Find out the ratio of the energy stored in the combined system to that stored initially in the single capacitor.