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A point charge q=2xx10^(-7)C is placed a...

A point charge q=`2xx10^(-7)`C is placed at the centre of a spherical cavity of radius 3 cm in a metal place. A and B are at distances 1.5 cm and 4.5 cm respectively from the centre of cavity.
The electric field intensities at a and b are

A

`8xx10^(6)`N/C and zero

B

zero and zero

C

zero and `8.9xx10^(5)`N/C

D

None of these

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