Two sphere of copper of diameters `10 cm` and `20 cm` will have thermal capacities in the ratio

Two spheres made of same substance have diameters in the ratio 1:2. their thermal capacities are in the ratio of

Two spheres made of same substance have diameters in the ratio 1:2. their thermal capacities are in the ratio of

Two spheres of radii 4 cm and 8 cm have the same amount of charge. Determine the ratio of their surface densities of charge.

Two insulated copper sphere of charges +10 mu C and -20 mu C have their centres seprated by a distance of 10 cm . What is the force of attraction if they placed. a in free space b. in water of dielectric constant 81.

Two uniform solid spheres made of copper have radii 15 cm and 20 cm respectively. Both of them are heated to a temperature of 70^(@)C and then placed in a region of ambient temperature equal to 45^(@)C . What will be the ratio of the initial rates of cooling of both the spheres?

Two uniform solid spheres made of copper have radii 15 cm and 20 cm respectively. Both of them are heated to a temperature of 70^(@)C and then placed in a region of ambient temperature equal to 45^(@)C . What will be the ratio of the initial rates of cooling of both the spheres?

Three solid metallic spheres of diameters 6 cm, 8 cm and 10 cm are melted and recast into a new solid sphere. The diameter of the new sphere is :