WBJEE 2021 Physics and Chemistry Solved Paper

PHYSICS

CATEGORY - I (Q1 to Q30)

Carry 1 mark each and only one option is correct. In case of incorrect answer or any combination of more than one answer, ¼ mark will be deducted.

Question : 17 of 80

Marks: +1, -0

A metal sphere of radius R carrying charge q is surrounded by a thick concentric metal shell of inner and outer radii a and b respectively. The net charge on the shell is zero. The potential at the centre of the sphere, when the outer surface of the shell is grounded will be

q
4π∈0
(
1
a
−
1
b
)
q
4π∈0
1
a
q
4π∈0
(
1
R
−
1
a
)
q
4π∈0
1
R

Validate

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