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NEET 2019 Physics and Chemistry
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© examsnet.com
Question : 46
Total: 90
A hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre
[NEET 2019]
Zero as r increases for r < R, decreases as r increases for r > R
Zero as r increases for r < R, increases as r increases for r > R
Decreases as r increases for r < R and for r > R
Increases as r increases for r < R and for r > R
Validate
Solution:
👈: Video Solution
Charge Q will be distributed over the surface of hollow metal sphere.
(i) For r < R (inside)
By Gauss law,
∮
E
i
n
.
d
S
=
q
e
n
ε
0
=
0
⇒
E
i
n
=
0
(
∵
q
e
n
=
0
)
(ii) For r > R (outside)
∮
E
0
.
d
S
=
q
e
n
ε
0
Here,
q
e
n
=
Q
(
∵
q
e
n
=
Q
)
∴
E
0
4
π
r
2
=
Q
ε
0
∴
E
0
∝
1
r
2
© examsnet.com
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