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Class 12 NEET Physics Electrostatics Questions Part 1
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© examsnet.com
Question : 27
Total: 100
The electric field in a certain region is acting radially outward and is given by E = Ar. A charge contained in a shepere of radius 'a' centred at the origin of the field, will be given by :
[NEET 2015 C]
A
ε
0
a
2
4
π
ε
0
A
a
3
ε
0
A
a
3
4
π
ε
0
A
a
2
Validate
Solution:
👈: Video Solution
Flux linked with sphere
→
E
.
d
→
s
since electric field is radial. It is always perpendicular to the surface.
so
ϕ
=
A
r
.
(
4
π
r
2
)
ϕ
=
A
(
a
)
(
4
π
r
2
)
(as r = a)
ϕ
=
A
4
π
a
3
Now according to gauss law
ϕ
=
q
i
n
/
∊
0
⇒
q
i
n
=
ϕ
.
∊
0
So
q
i
n
=
A
4
π
a
3.
∊
0
© examsnet.com
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