Physics-
The stress - strain graphs for materials A and B are as shown. Choose the correct alternative


Physics-General
- Young’s modulus of B is greater than that of A
- material A is stronger than material B
- Young’s modulus of A is greater than that of B
- material B is stronger than material A
Answer:The correct answer is: material B is stronger than material A
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physics-
In the experiment to determine Young’s modulus of the material of a wire under tension used in the arrangement as shown. The percentage error in the measurement of length is ‘a’, in the measurement of the radius of the wire is ‘b’ and in the measurement of the change in length of the wire is ‘c’. Percentage error in the measurement of Young’s modulus for a given load is

In the experiment to determine Young’s modulus of the material of a wire under tension used in the arrangement as shown. The percentage error in the measurement of length is ‘a’, in the measurement of the radius of the wire is ‘b’ and in the measurement of the change in length of the wire is ‘c’. Percentage error in the measurement of Young’s modulus for a given load is

physics-General
physics-
The graph shows the change ' ' Dl in the length of a thin uniform wire used by the application of force ‘F’ at different temperatures T1 and T2 The variation suggests that

The graph shows the change ' ' Dl in the length of a thin uniform wire used by the application of force ‘F’ at different temperatures T1 and T2 The variation suggests that

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physics-
The load versus extension graph for four wires of same material is shown. The thinnest wire is represented by the line

The load versus extension graph for four wires of same material is shown. The thinnest wire is represented by the line

physics-General
maths-
The solution of the differential equation
represent
The solution of the differential equation
represent
maths-General
physics-
In the capacitor shown in the circuit is changed to 5 V and left in the circuit, in 12s the charge on the capacitor will become 

Final charge on capacitor is

where
= charge on capacitor at 
=time constant of the circuit.
Putting

Given,
Hence,

where
Putting
Given,
Hence,
In the capacitor shown in the circuit is changed to 5 V and left in the circuit, in 12s the charge on the capacitor will become 

physics-General
Final charge on capacitor is

where
= charge on capacitor at 
=time constant of the circuit.
Putting

Given,
Hence,

where
Putting
Given,
Hence,
physics-
In the given figure, a hollow spherical capacitor is shown. The electric field will not be zero at

The electric field of a hollow spherical capacitor is localised in between inner and outer surface of the spherical conductor.
Therefore, at point
, the electric field will not be zero.
Therefore, at point
In the given figure, a hollow spherical capacitor is shown. The electric field will not be zero at

physics-General
The electric field of a hollow spherical capacitor is localised in between inner and outer surface of the spherical conductor.
Therefore, at point
, the electric field will not be zero.
Therefore, at point
physics-
A 2
capacitor is charged as shown in the figure. The percentage of its stored energy dissipated after the switch
is turned to positions 2 is

This charge will remain constant after switch is shifted from position 1 to position 2.
A 2
capacitor is charged as shown in the figure. The percentage of its stored energy dissipated after the switch
is turned to positions 2 is

physics-General
This charge will remain constant after switch is shifted from position 1 to position 2.
physics-
What is the potential difference between points
in the circuit shown?

Consider the charge distribution as shown. Considering the branch on upper side, we have



Here,
…(i)
…(ii)
From Eqs. (i) and (ii), we get


Similarly for the lower side branch
…(iii)
...(iv)
From Eqs. (iii) and (iv)




Here,
From Eqs. (i) and (ii), we get
Similarly for the lower side branch
From Eqs. (iii) and (iv)
What is the potential difference between points
in the circuit shown?

physics-General
Consider the charge distribution as shown. Considering the branch on upper side, we have



Here,
…(i)
…(ii)
From Eqs. (i) and (ii), we get


Similarly for the lower side branch
…(iii)
...(iv)
From Eqs. (iii) and (iv)




Here,
From Eqs. (i) and (ii), we get
Similarly for the lower side branch
From Eqs. (iii) and (iv)
maths-
If m and n are order and degree of the equatio
then
If m and n are order and degree of the equatio
then
maths-General
maths-
Solution of differential equation
is
Solution of differential equation
is
maths-General
physics-
What is the potential difference across 2
F capacitor in the circuit shown?


Net emf in the circuit here
While the equivalent capacity
Charge on each capacitor
What is the potential difference across 2
F capacitor in the circuit shown?

physics-General

Net emf in the circuit here
While the equivalent capacity
Charge on each capacitor
physics-
Two insulating plates are both uniformly charged in such a way that the potential difference between them is
V. (
, plate 2 is at a higher potential). The plates are separated by
m and can be treated as infinitely large. An electron is released from rest on the inner surface of plate 1. What is its speed when it hits plate 2? (e=1.6

Since
so electric field will point from plate 2 to plate 1.
The electron will experience an electric force, opposite to the direction of electric field, and hence move towards the plate 2.

Use work-energy theorem to find speed of electron when it strikes the plate 2.

Where
is the required speed.


The electron will experience an electric force, opposite to the direction of electric field, and hence move towards the plate 2.

Use work-energy theorem to find speed of electron when it strikes the plate 2.
Where
Two insulating plates are both uniformly charged in such a way that the potential difference between them is
V. (
, plate 2 is at a higher potential). The plates are separated by
m and can be treated as infinitely large. An electron is released from rest on the inner surface of plate 1. What is its speed when it hits plate 2? (e=1.6

physics-General
Since
so electric field will point from plate 2 to plate 1.
The electron will experience an electric force, opposite to the direction of electric field, and hence move towards the plate 2.

Use work-energy theorem to find speed of electron when it strikes the plate 2.

Where
is the required speed.


The electron will experience an electric force, opposite to the direction of electric field, and hence move towards the plate 2.

Use work-energy theorem to find speed of electron when it strikes the plate 2.
Where
physics-
In given circuit when switch
has been closed then charge on capacitor
and
respectively are

The circuit is given as

Let
be the charge after switch
has been closed.
Then,

…(i)
But we know that, charge is conserved

or
…(ii)
On putting the value of
Eq. (ii)



Now, from Eq. (i)


Hence,

Let
Then,
But we know that, charge is conserved
or
On putting the value of
Now, from Eq. (i)
Hence,
In given circuit when switch
has been closed then charge on capacitor
and
respectively are

physics-General
The circuit is given as

Let
be the charge after switch
has been closed.
Then,

…(i)
But we know that, charge is conserved

or
…(ii)
On putting the value of
Eq. (ii)



Now, from Eq. (i)


Hence,

Let
Then,
But we know that, charge is conserved
or
On putting the value of
Now, from Eq. (i)
Hence,
physics-
Calculate the force ' ' F that is applied horizontally at the axle of the wheel which is necessary to raise the wheel over the obstacle of height 4m. Radius of the wheel is 1m and its mass is 

applying principle of moments
F (0.6)=100(0.8)
ÞF=133.3N
F (0.6)=100(0.8)
ÞF=133.3N
Calculate the force ' ' F that is applied horizontally at the axle of the wheel which is necessary to raise the wheel over the obstacle of height 4m. Radius of the wheel is 1m and its mass is 

physics-General
applying principle of moments
F (0.6)=100(0.8)
ÞF=133.3N
F (0.6)=100(0.8)
ÞF=133.3N
physics-
A wheel of radius ‘r’ and mass ‘m’ stands in front of a step of height 'h’ The least horizontal force which should be applied to the axle of the wheel to allow it to raise onto the step is

Applying the condition of rotational equilibrium,

But

But
A wheel of radius ‘r’ and mass ‘m’ stands in front of a step of height 'h’ The least horizontal force which should be applied to the axle of the wheel to allow it to raise onto the step is

physics-General
Applying the condition of rotational equilibrium,

But

But