Charge Q is distributed to two different metallic spheres having radii R anot 2R such that both spheres have equal surface charge density, then charge on large sphere is

On larger sphere the charge is 4 time of small sphere because surface charge density is equal to the number of charge per area but larger sphere have twice of radius of smaller sphere therefore the area of large sphere is 4 times of small sphere thus charge on larger sphere is 4 times of small sphere charge.