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An ellipsoidal cavity is carved within a...

An ellipsoidal cavity is carved within a perfect conductor. A positive charge q is placed at the centre of the cavity. The points A and B are on the cavity surface as shown in the figure. Then

A

`a,b,c,d` are correct

B

`a,b,c` are correct

C

only `a` and `b` are correct

D

only `c` and `d` are correct

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