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A point charge q , is placed at a distan...

A point charge q , is placed at a distance r from the centre of an aluminium sphere, of radius R `( r gt R )` . Selectr the correct alternatives.

A

When the switch is open , the potential at O is `(q)/( 4pi epsilon_(0)r)`

B

When the switch is closed, the potential at O is zero

C

A charge -q is induced on left half of the sphere, when switch is kept open

D

When switch is closed , sphere acquires a net charge `( - qR)/ ( r)`

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(1,2,4)
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