Physics
A car moving over a straight path covers a distance x with constant speed 10ms-1 and then the same distance with constant speed of V1.If average speed of the car is , 16 ms-1 then V2=...
PhysicsGeneral
- 30 ms-1
- 20 ms-1
- 40 ms-1
- 25 ms-1
Answer:The correct answer is: 40 ms-1
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physics-
A copper wire of negligible mass, 1 m length and cross-sectional area
is kept on a smooth horizontal table with one end fixed. A ball of mass 1 kg is attached to the other end. The wire and the ball are rotated with an angular velocity 20 rad
If the elongation in the wire is
, then the Young’s modulus is
Or
A copper wire of negligible mass, 1 m length and cross-sectional area
is kept on a smooth horizontal table with one end fixed. A ball of mass 1 kg is attached to the other end. The wire and the ball are rotated with an angular velocity 20 rad
If the elongation in the wire is
, then the Young’s modulus is
physics-General
Or
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Two wires of equal cross-section but one made of steel and the other of copper are joined end to end. When the combination is kept under tension, the elongations in the two wires are found to be equal. What is the ratio of the lengths of the two wires? (Given : steel = 
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Two wires of equal cross-section but one made of steel and the other of copper are joined end to end. When the combination is kept under tension, the elongations in the two wires are found to be equal. What is the ratio of the lengths of the two wires? (Given : steel = 
physics-General
Since, cross-sections are equal and same tension exists in both the wires, therefore, the stresses developed are equal.
Also,
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The relation between
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If
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A bus travels between two points A and B. V1 and V2 are it average speed and average velocity then
A bus travels between two points A and B. V1 and V2 are it average speed and average velocity then
physicsGeneral
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If
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If
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Two long parallel conductors carry currents in opposite directions as shown. One conductor carries a current of 10 A and the distance between the wires is d=10cm Current I is adjusted, so that the magnetic field at P is zero. P is at a distance of 5 cm to the right of the 10 A current. Value of I is

From Biot-Savart’s law the magnetic field
due to a conductor carrying current
at a distance
is

Magnetic field at
due to current in second conductor is

From Fleming’s right hands rule the fields at
are directed opposite.


Given,



Magnetic field at
From Fleming’s right hands rule the fields at
Given,

Two long parallel conductors carry currents in opposite directions as shown. One conductor carries a current of 10 A and the distance between the wires is d=10cm Current I is adjusted, so that the magnetic field at P is zero. P is at a distance of 5 cm to the right of the 10 A current. Value of I is

physics-General
From Biot-Savart’s law the magnetic field
due to a conductor carrying current
at a distance
is

Magnetic field at
due to current in second conductor is

From Fleming’s right hands rule the fields at
are directed opposite.


Given,



Magnetic field at
From Fleming’s right hands rule the fields at
Given,

physics-
Two long straight wires are set parallel to each other. Each carries a current
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Magnetic field at mid-point due to wire

Resultant of Magnetic field


Magnetic field at mid-point due to wire
Resultant of Magnetic field
Two long straight wires are set parallel to each other. Each carries a current
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physics-General
Magnetic field at mid-point due to wire 

Magnetic field at mid-point due to wire

Resultant of Magnetic field


Magnetic field at mid-point due to wire
Resultant of Magnetic field
physics-
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 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

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In the figure shown, the magnetic field induction at the point
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Field due to a straight wire of infinite length is
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out of the page

In the figure shown, the magnetic field induction at the point
will be

physics-General
Field due to a straight wire of infinite length is
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physics
A car covers one third part of its straight path with speed V1 and the rest with speed V2 . What is its average speed ?
A car covers one third part of its straight path with speed V1 and the rest with speed V2 . What is its average speed ?
physicsGeneral
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PQ and RS are long parallel conductors separated by certain distance. M is the mid-point between them (see the figure). The net magnetic field at M is B. Now, the current 2A is switched off. The field at M now becomes

Magnetic field at mid-point
in first case is 


When the current 2 A is switched off, the net magnetic field at
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When the current 2 A is switched off, the net magnetic field at
PQ and RS are long parallel conductors separated by certain distance. M is the mid-point between them (see the figure). The net magnetic field at M is B. Now, the current 2A is switched off. The field at M now becomes

physics-General
Magnetic field at mid-point
in first case is 


When the current 2 A is switched off, the net magnetic field at
is due to current 1 A

When the current 2 A is switched off, the net magnetic field at
physics-
Current through ABC and A’ B’ C’ is I. What is the magnetic field at P?
(Here C’ B’ PBC are collinear)

Magnetic field 


Current through ABC and A’ B’ C’ is I. What is the magnetic field at P?
(Here C’ B’ PBC are collinear)

physics-General
Magnetic field 


physics
The ratio of pathlength and the respective time interval is
The ratio of pathlength and the respective time interval is
physicsGeneral
physics-
A wire shown in figure carries a current of 40 A. If
, the magnetic field at point
will be

Let the given circular
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at its centre. Then, magnetic field due to this circular part is



Given,




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A wire shown in figure carries a current of 40 A. If
, the magnetic field at point
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physics-General
Let the given circular
part of wire subtends an angle
at its centre. Then, magnetic field due to this circular part is



Given,




Given,