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Byju's Answer
Standard XII
Physics
Kepler's Law
Find an expre...
Question
Find an expression for the electric field at
r
<
a
A
k
e
q
r
2
(
−
^
r
)
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B
k
e
q
r
2
^
r
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C
2
k
e
q
r
2
(
−
^
r
)
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D
2
k
e
q
r
2
^
r
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Solution
The correct option is
D
2
k
e
q
r
2
^
r
Inner radius
=
a
outer radius
=
b
conductor is hollow
(
r
<
a
)
charge
=
2
Q
ϕ
A
=
Using Gauss's law
=
E
A
=
Q
ϵ
0
=
2
k
e
q
r
2
(
−
r
T
)
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0
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