NCERT Solutions
Board Paper Solutions
Ask & Answer
School Talk
Login
GET APP
Login
Create Account
Popular
Latest
Expert Answers
ALL
Mitali
Subject: Physics
, asked on 29/4/18
Q. A thin walled long-half cylindrical tube of radius R carries a current i as shown in the figure. The magnitude of magnetic field at point P is
(A)
μ
0
i
π
2
R
T
(B)
μ
0
i
π
R
T
Answer
1
Bhavya Jain
Subject: Physics
, asked on 28/4/18
How can I solve this question related to current due to curved wire ?
Q.50. A current of 10 A is passing through a long wire which has semicircular loop of the radius 20 cm as shown in the figure. Magnetic field produced at the centre of the loop is :
(a) 10
πμ
T
(b) 5
πμ
T
(c) 4
πμ
T
(d) 2
πμ
T
Answer
1
Aryan Felix
Subject: Physics
, asked on 27/4/18
What is the torque required to hold a small circular coil of 10 turns, area 1 mm
2
and carrying a current of (31/53) in the middle of a long solenoid of 10
4
turns/meter carrying a current of 3.5 A, with its axis perpendicular to the axis of the solenoid?
Answer
1
Lavneesh Rajput
Subject: Physics
, asked on 25/4/18
Solve this:
Q. A 5 N force acts on a 15 kg body initially at rest. The work done by the force in the third second of its motion is (in joules) approximately equal to
(a) 9
(b) 15
(c) 4
(d) 20
Answer
1
Lavneesh Rajput
Subject: Physics
, asked on 25/4/18
Q). Please derive this equation of energy of a wave given by y = A cos (wt)
Total energy =
1
2
m
A
2
ω
2
Answer
1
Lavneesh Rajput
Subject: Physics
, asked on 24/4/18
Solve this:
Q8. The change in the entropy of a 1 mole of an ideal gas which went through an isothermal process from an initial state (P
1
, V
1
, T) to the final state (P
2
, V
2
, T) is equal to
(a) zero (b) R In T
(c) R In
V
1
V
2
(d) R In
V
2
V
1
Answer
1
Lavneesh Rajput
Subject: Physics
, asked on 24/4/18
Solve this:
Q.27. An open U-tube contains mercury. When 11.2 cm of water is poured into one of the arms of the tube, how high does the mercury rise in the other arm from its initial level
(a) 0.56 cm
(b) 1.35 cm
(c) 0.41 cm
(d) 2.32 cm
Answer
1
Jassimrat Kaur
Subject: Physics
, asked on 24/4/18
Please solve question 12
Q12. If a charged particle of charge 5
μ
C and mass 5 g is moving with constant speed 5 m/s in a uniform magnetic field B on a curve x
2
+ y
2
= 25, where x and y are in metre. The value of magnetic field will be
a. 1 tesla
b. 1 kilo tesla along z-axis
c. 5 kilo tesla long the x-axis
d. 1 kilo tesla along any line in the x- y plane
Answer
1
Lavneesh Rajput
Subject: Physics
, asked on 24/4/18
Solve this:
Q19. In the adjacent figure is shown a closed path P. A long straight conductor carrying a current
I
passes through O and perpendicular to the plane of the paper. Then which of the following holds good
(a)
∮
B
→
.
d
l
→
b
∮
B
→
.
dl
→
=
μ
0
I
p
c
∮
B
→
.
dl
→
>
μ
0
I
p
(d) none of these
Answer
1
Lavneesh Rajput
Subject: Physics
, asked on 24/4/18
Solve:
One end of a string of length l is connected to a particle of mass m and the other to small peg on a
smooth horizontal table. If the particle moves in a circle with speed v the net force on the particle
(directed towards the centre) is
a
.
T
b
.
T
-
m
v
2
l
c
.
T
+
m
v
2
l
d
.
0
Answer
1
Aparna Sahu
Subject: Physics
, asked on 24/4/18
Q.8. Steel has Young's modulus
21
×
10
11
d
y
n
e
/
c
m
2
and density 7.8 gm/cc. The velocity of sound through steel is
(a) 350 m/s
(b) 700 m/s
(c) 5000 m/s
(d) 5789 m/s
Answer
1
Aparna Sahu
Subject: Physics
, asked on 23/4/18
Solve this:
Q.9. The coefficient of cubical expansion of sulphur is 0.000223 per
°
A piece of sulphur is found to displace 48 cc of water at 0
°
C. It will displace the volume of water at 35
°
C
(a) 48.374 cc
(b) 48.743 cc
(c) 49.374 cc
(d) 49.743 cc
Answer
1
Lavneesh Rajput
Subject: Physics
, asked on 23/4/18
Solve this :
Q. An ice-cream has a marked value of 350 cal. Energy delivered by this ice-cream to the body is (The calorie in this case is a kilocalorie)
(a) 0.407 kWh (b) 3.50 kWh
(c) 1.750 kWh (d) 7.00 kWh
Answer
1
Aparna Sahu
Subject: Physics
, asked on 23/4/18
Solve this :
37. In a conical pendulum the length of strings is l and
θ
is the angle of string with vertile . The time period of revolution is :
(
a
)
2
π
l
g
(
b
)
2
π
l
cosθ
g
(
c
)
2
π
l
g
cosθ
(
d
)
infinite
Answer
2
Aparna Sahu
Subject: Physics
, asked on 23/4/18
Solve this:
Q.66. A square frame of side l carries a current i. The magnetic field at its centre is B. The same current is passed through a circular coil having the same perimeter as the square, The field at the centre of the circular coil is B'. The ratio of B and B' is
(a)
8
2
π
2
(b)
8
2
π
3
(c)
8
2
π
(d)
4
2
π
2
Answer
1
Prev
1
2
3
4
5
Next
What are you looking for?
(A)
(B)
Q.50. A current of 10 A is passing through a long wire which has semicircular loop of the radius 20 cm as shown in the figure. Magnetic field produced at the centre of the loop is :
(a) 10 T
(b) 5 T
(c) 4 T
(d) 2 T
Q. A 5 N force acts on a 15 kg body initially at rest. The work done by the force in the third second of its motion is (in joules) approximately equal to
(a) 9
(b) 15
(c) 4
(d) 20
Total energy =
Q8. The change in the entropy of a 1 mole of an ideal gas which went through an isothermal process from an initial state (P1, V1, T) to the final state (P2, V2, T) is equal to
(a) zero (b) R In T
(c) R In (d) R In
Q.27. An open U-tube contains mercury. When 11.2 cm of water is poured into one of the arms of the tube, how high does the mercury rise in the other arm from its initial level
(a) 0.56 cm
(b) 1.35 cm
(c) 0.41 cm
(d) 2.32 cm
Q12. If a charged particle of charge 5C and mass 5 g is moving with constant speed 5 m/s in a uniform magnetic field B on a curve x2 + y2 = 25, where x and y are in metre. The value of magnetic field will be
a. 1 tesla
b. 1 kilo tesla along z-axis
c. 5 kilo tesla long the x-axis
d. 1 kilo tesla along any line in the x- y plane
Q19. In the adjacent figure is shown a closed path P. A long straight conductor carrying a current I passes through O and perpendicular to the plane of the paper. Then which of the following holds good
(a)
(d) none of these
One end of a string of length l is connected to a particle of mass m and the other to small peg on a
smooth horizontal table. If the particle moves in a circle with speed v the net force on the particle
(directed towards the centre) is
(a) 350 m/s
(b) 700 m/s
(c) 5000 m/s
(d) 5789 m/s
Q.9. The coefficient of cubical expansion of sulphur is 0.000223 per A piece of sulphur is found to displace 48 cc of water at 0C. It will displace the volume of water at 35C
(a) 48.374 cc
(b) 48.743 cc
(c) 49.374 cc
(d) 49.743 cc
Q. An ice-cream has a marked value of 350 cal. Energy delivered by this ice-cream to the body is (The calorie in this case is a kilocalorie)
(a) 0.407 kWh (b) 3.50 kWh
(c) 1.750 kWh (d) 7.00 kWh
37. In a conical pendulum the length of strings is l and is the angle of string with vertile . The time period of revolution is :
Q.66. A square frame of side l carries a current i. The magnetic field at its centre is B. The same current is passed through a circular coil having the same perimeter as the square, The field at the centre of the circular coil is B'. The ratio of B and B' is
(a)
(b)
(c)
(d)