JEE Advanced Model Paper 15 with solutions for online practice

Two conducting uncharged spheres of radius r1 and R2 (R1 > R3) are connected to a battery with a switch as shown. Light rays of frequency f are incident on the bigger sphere and simultaneously the switch is closed work function of bigger sphere is Φ . After some time the charge on bigger sphere becomes q1 , and on smaller sphere becomes - q2 remains constant there after. Then