NCERT Solutions
Board Paper Solutions
Ask & Answer
School Talk
Login
GET APP
Login
Create Account
Popular
Latest
Expert Answers
ALL
Raj Aryan
Subject: Physics
, asked on 17/5/18
Q).
This side is extended to infinity. Now what will be the value of electric flux due to charge q.
(Answer:
q
24
ε
0
Answer
1
Shivansh Ahuja
Subject: Physics
, asked on 16/5/18
Two concentric spheres are given equal amount of charge of the same nature then which may have higher potential
Answer
1
Shivansh Ahuja
Subject: Physics
, asked on 16/5/18
Two short dipoles each of dipole moment p are placed at origin. The dipole moment of one dipole is along x axis and other is along y axis. The magnitude of electric field at a point (a,0)is given by
Answer
2
Kabir Chhabra
Subject: Physics
, asked on 16/5/18
1) In the diagram shown the charge + Q is fixed. Another charge + 2q and mass M is projected from a distance R from the fixed charge. Minimum septation between the two charges if the velocity becomes
1
3
times of the projected velocity, at this moment is. (Assume gravity to be absent)
(
a
)
3
2
R
(
b
)
1
3
R
(
c
)
1
2
R
(
d
)
N
o
n
e
o
f
t
h
e
s
e
Answer
1
Kabir Chhabra
Subject: Physics
, asked on 16/5/18
Q38
38.
A point charge Q is located on the axis of a disc of radius R at a distance b from the plane of the disc (figure). Show that if one-fourth of the electric flux from the charge passes through the disc, then R=
3
b.
Answer
1
Deepika Walia
Subject: Physics
, asked on 15/5/18
Solve this:
Q. In a certain region of space, variation of potential with distance from origin as we move along x-axis is given by V = 8
x
2
+ 2, where x is the x-coordinate of a point in space. The magnitude of electric field at a point (- 4, 0) is
(1) - 16 V/m
(2) 16 V/m
(3) - 64 V/m
(4) 64 V/m
Answer
1
Deepika Walia
Subject: Physics
, asked on 15/5/18
Solve this:
Q. Six point charges are placed at the vertices of a regular hexagon of side a as shown. If E represents electric field and V represents electric potential at O, then
(1) E = 0 but V
≠
0
(2) E
≠
0 but V = 0
(3) E = 0 and V = 0
(4) E
≠
0 and V
≠
0
Answer
2
Deepika Walia
Subject: Physics
, asked on 15/5/18
Solve this:
Q3. Electric potential in a region is varying according to the relation V =
3
x
2
2
-
y
2
4
, where x and y are in metre and V is in volt. Electric field intensity (in N/C) at a point (1 m, 2 m) is
(1) 3
i
^
–
j
^
(2) –3
i
^
+
j
^
(3) 6
i
^
– 2
j
^
(4) – 6
i
^
+ 2
j
^
Answer
1
Deepika Walia
Subject: Physics
, asked on 15/5/18
Solve this:
6. Electric charges having some magnitude of electric charge 'q' coulombs are placed at x=1 m, 2 m, 4 m, 8m..... so on. If any two consecutive charges have opposite sign but the first charge is necessarily positive, what will be the potential at x=0 ?
1
Infinity
2
Zero
3
1
4
πε
0
2
q
3
4
1
4
πε
0
2
q
Answer
1
Deepika Walia
Subject: Physics
, asked on 15/5/18
Solve this:
Q.28. Calculate the work done in taking a charge - 2
×
10
-
9
C from A to B via C (in diagram)
(1) 0.2 joule
(2) 1.2 joule
(3) 2.2 joule
(4) zero
Answer
1
Deepika Walia
Subject: Physics
, asked on 15/5/18
Solve this:
Q.24. Three charges - q, Q and - q are placed respectively at equal distances on a straight line. If the potential energy of the system of three charges is zero, then what is the ratio of Q : q?
(1) 1 : 1
(2) 1 : 2
(3) 1 : 3
(4) 1 : 4
Answer
1
Deepika Walia
Subject: Physics
, asked on 15/5/18
Solve this:
Q17. Determine the electric field strength vector if the potential of this field depends on x, y coordinates as V = 10 axy
(1) 10 a (y
i
^
+ x
j
^
) (2) – 10 a [y
i
^
+ x
j
^
]
(3) – a [y
i
^
+ x
j
^
] (4) –10 a [x
i
^
+ y
k
^
]
Answer
1
Deepika Walia
Subject: Physics
, asked on 15/5/18
Solve this:
Q. An electric dipole of length 2 cm is placed with its axis making an angle of 30
°
to a uniform electric field
10
5
N/C. If it experiences a torque of
10
3
Nm, then potential energy of the dipole
(1) - 10 J
(2) - 20 J
(3) - 30 J
(4) - 40 J
Answer
1
Deepika Walia
Subject: Physics
, asked on 15/5/18
A
c
h
a
r
g
e
o
f
10
μ
C
i
s
p
l
a
c
e
d
a
t
t
h
e
o
r
i
g
i
o
n
o
f
x
-
y
c
o
o
r
d
i
n
a
t
e
s
y
s
t
e
m
.
T
h
e
p
o
t
e
n
t
i
a
l
d
i
f
f
e
r
e
n
c
e
b
e
t
w
e
e
n
t
w
o
p
o
i
n
t
s
0
,
a
a
n
d
a
,
0
i
n
v
o
l
t
s
w
i
l
l
b
e
1
9
×
10
4
a
2
9
×
10
4
a
2
3
9
×
10
4
2
a
4
z
e
r
o
Answer
4
Deepika Walia
Subject: Physics
, asked on 15/5/18
Solve this: Three isolated equal charges are placed at the three corners of an equilateral triangle as shown in figure. The statement which is true for net electric potential V and net electric field intensity E at the centre of the triangle is
1
.
E
=
0
,
V
=
0
2
.
V
=
0
,
E
≠
0
3
.
E
=
0
,
V
≠
0
4
.
E
≠
0
,
V
≠
0
Answer
1
Prev
1
2
3
4
5
Next
What are you looking for?
(Answer:
38. A point charge Q is located on the axis of a disc of radius R at a distance b from the plane of the disc (figure). Show that if one-fourth of the electric flux from the charge passes through the disc, then R= b.
Q. In a certain region of space, variation of potential with distance from origin as we move along x-axis is given by V = 8 + 2, where x is the x-coordinate of a point in space. The magnitude of electric field at a point (- 4, 0) is
(1) - 16 V/m
(2) 16 V/m
(3) - 64 V/m
(4) 64 V/m
Q. Six point charges are placed at the vertices of a regular hexagon of side a as shown. If E represents electric field and V represents electric potential at O, then
(1) E = 0 but V0
(2) E 0 but V = 0
(3) E = 0 and V = 0
(4) E 0 and V0
Q3. Electric potential in a region is varying according to the relation V = , where x and y are in metre and V is in volt. Electric field intensity (in N/C) at a point (1 m, 2 m) is
(1) 3– (2) –3+
(3) 6– 2 (4) – 6 + 2
6. Electric charges having some magnitude of electric charge 'q' coulombs are placed at x=1 m, 2 m, 4 m, 8m..... so on. If any two consecutive charges have opposite sign but the first charge is necessarily positive, what will be the potential at x=0 ?
Q.28. Calculate the work done in taking a charge - 2 C from A to B via C (in diagram)
(1) 0.2 joule
(2) 1.2 joule
(3) 2.2 joule
(4) zero
Q.24. Three charges - q, Q and - q are placed respectively at equal distances on a straight line. If the potential energy of the system of three charges is zero, then what is the ratio of Q : q?
(1) 1 : 1
(2) 1 : 2
(3) 1 : 3
(4) 1 : 4
Q17. Determine the electric field strength vector if the potential of this field depends on x, y coordinates as V = 10 axy
(1) 10 a (y + x) (2) – 10 a [y + x]
(3) – a [y + x] (4) –10 a [x + y]
Q. An electric dipole of length 2 cm is placed with its axis making an angle of 30 to a uniform electric field N/C. If it experiences a torque of Nm, then potential energy of the dipole
(1) - 10 J
(2) - 20 J
(3) - 30 J
(4) - 40 J