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JEE Advanced Model Paper 15 with solutions for online practice

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Question : 17

Total: 60

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

q1
4πε0R1
+
q2
4πε0R2
= V
The number of electrons emitted by larger sphere is
q1−q2
e
when e is the charge of an electron
eq1
4πε0R1
= hf - Φ
The number of electrons emitted by larger sphere is independent of the potential of the battery

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