7 Replies
@Gyro Gearloose
Note for OP
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basically u do know that electric field inside a hollow sphere or a conductign solid sphere is always zero due to its surface charge and any other outside charge right?
so electric field on surface = k * 2q/(2R)^2
so 1st option seems right
yeah 1st option i got
answer is ACD
cant do C part
for it basically u need to understand that potential at C due to inner point charge and the charges induced on inner surface of the sphere will cancel each other out so that leaves us with potential due to outer surface + potential due to 2q=0 sinc net potential at C should be zero cuz grounded
So you get q'=-q where q' is the charge bcz of earthing
Okk
If you had to calculate B part what would you do
Before switching the field inside isnt zero right?, because of the charge q