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JEE Advanced 2022 Paper 1
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© examsnet.com
Question : 31
Total: 54
Six charges are placed around a regular hexagon of side length a as shown in the figure. Five of them have charge
q
, and the remaining one has charge
x
. The perpendicular from each charge to the nearest hexagon side passes through the center
O
of the hexagon and is bisected by the side.
Which of the following statement(s) is(are) correct in SI units?
When
x
=
q
, the magnitude of the electric field at
O
is zero.
When
x
=
−
q
, the magnitude of the electric field at
O
is
q
6
π
∈
0
a
2
.
When
x
=
2
q
, the potential at
O
is
7
q
4
√
3
π
E
0
a
.
When
x
=
−
3
q
, the potential at
O
is
3
q
4
√
3
π
E
0
a
.
Validate
Solution:
(A) Due to symmetry
→
E
0
=
0
E
net
=
kq
(
2
d
)
2
×
2
=
2
q
×
4
4
π
ε
0
⋅
4
⋅
3
a
2
=
q
6
π
ε
0
a
2
(C)
v
=
7
kq
2
d
=
7
q
4
π
ε
0
⋅
√
3
a
=
7
q
4
√
3
π
ε
0
q
(D)
v
=
2
kq
2
d
=
2
q
4
π
ε
0
⋅
√
3
a
=
q
2
√
3
π
ε
0
q
© examsnet.com
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