Physics-
General
Easy
Question
The figure shows a uniform rod lying along the x-axis. The locus of all the points lying on the xy-plane, about which the moment of inertia of the rod is same as that about O is
- an ellipse
- a circle
- a parabola
- a straight line
The correct answer is: a circle
Related Questions to study
physics-
Two smooth balls A and B, each of mass m and radius R, have their centre at (0,0,R) and at (5R,–R,R) respectively, in a coordinate system as shown. Ball A, moving along positive x axis, collide with ball B. Just before the collision, speed of ball A is 4 m/s and ball B is stationary. The collision between the balls is elastic.
Velocity of the ball A just after the collision is 3j) m/s
Two smooth balls A and B, each of mass m and radius R, have their centre at (0,0,R) and at (5R,–R,R) respectively, in a coordinate system as shown. Ball A, moving along positive x axis, collide with ball B. Just before the collision, speed of ball A is 4 m/s and ball B is stationary. The collision between the balls is elastic.
Velocity of the ball A just after the collision is 3j) m/s
physics-General
physics-
A carpet of mass 'M' made of inextensible material is rolled along its length in the form of a cylinder of radius 'R' and is kept on a rough floor. The carpet starts unrolling without sliding on the floor when a negligibly small push is given to it. The horizontal velocity of the axis of the cylindrical part of the carpet when its radius reduce to R/2 will be:
A carpet of mass 'M' made of inextensible material is rolled along its length in the form of a cylinder of radius 'R' and is kept on a rough floor. The carpet starts unrolling without sliding on the floor when a negligibly small push is given to it. The horizontal velocity of the axis of the cylindrical part of the carpet when its radius reduce to R/2 will be:
physics-General
physics-
A composite bar of length 
is made up from a rod of material 1 and of length L1 attached to a rod of material 2 and of length L2 as shown. If 
and 
are their respective coefficients of linear expansion, then equivalent coefficient of linear expansion for the composite rod is:
A composite bar of length is made up from a rod of material 1 and of length L1 attached to a rod of material 2 and of length L2 as shown. If and are their respective coefficients of linear expansion, then equivalent coefficient of linear expansion for the composite rod is:
physics-General
physics-
The observer 'O' se the distance AB as infinitely large. If refractive index of liquid is and that of glass 
is:
The observer 'O' se the distance AB as infinitely large. If refractive index of liquid is and that of glass is:
physics-General
physics-
Figure shows two conducting thin concentric shells of radii r and 3r. The outer shell carri charge q and inner shell is neutral. The amount of charge which flows from inner shell to the earth after the key K is closed, is equal to:
Figure shows two conducting thin concentric shells of radii r and 3r. The outer shell carri charge q and inner shell is neutral. The amount of charge which flows from inner shell to the earth after the key K is closed, is equal to:
physics-General
physics-
Two conducting large plat 
& 
are placed parallel to each other at very small separation 'd'. The plate area of either face of plate is A. A charge +2Q is given to plate & –Q to the plate (neglect ends effects). If plate & are now connected by conducting wire, then total amount of heat produced is
Two conducting large plat & are placed parallel to each other at very small separation 'd'. The plate area of either face of plate is A. A charge +2Q is given to plate & –Q to the plate (neglect ends effects). If plate & are now connected by conducting wire, then total amount of heat produced is
physics-General
physics-
An object is placed infront of a converging lens at a distance equal to twice the focal length 
of the lens. On the other side of the lens is a concave mirror of focal length 
separated from the lens by a distance 
. Light from the object pass rightward through the lens, reflects from the mirror, pass leftward through the lens and forms a final image of the object.
An object is placed infront of a converging lens at a distance equal to twice the focal length of the lens. On the other side of the lens is a concave mirror of focal length separated from the lens by a distance . Light from the object pass rightward through the lens, reflects from the mirror, pass leftward through the lens and forms a final image of the object.
physics-General
physics-
Two particle of charge q1 and q2 are separated by distance d as shown in figure. Charge q1 is situated at the origin. The net electric field due to the particle is zero at x = d/4. With V = 0 at infinity, the location of a point in terms of d on the x axis (other than at infinity) at which the electrical potential due to the two particle is zero, is given by:
Two particle of charge q1 and q2 are separated by distance d as shown in figure. Charge q1 is situated at the origin. The net electric field due to the particle is zero at x = d/4. With V = 0 at infinity, the location of a point in terms of d on the x axis (other than at infinity) at which the electrical potential due to the two particle is zero, is given by:
physics-General
physics-
1mC. charge is uniformly distributed on a spherical shell given by equation 
What will be intensity of electric field at a point (1, 1, 2)?
1mC. charge is uniformly distributed on a spherical shell given by equation What will be intensity of electric field at a point (1, 1, 2)?
physics-General
physics-
An electron is placed just in the middle between two long fixed line charge of charge density + The wire are in the xy plane (Do not consider gravity)
An electron is placed just in the middle between two long fixed line charge of charge density + The wire are in the xy plane (Do not consider gravity)
physics-General
physics-
Consider a gaussian spherical surface, covering a dipole of charge q and –q, then 
Consider a gaussian spherical surface, covering a dipole of charge q and –q, then
physics-General
physics-
acitor 
in the circuit is a variable acitor (its acitance can be varied). Graph is plotted between potential difference 
(across acitor 
) versus . Electric potential approaches on asymtote of 10 V as 
The acitance of 
is equal to:
acitor in the circuit is a variable acitor (its acitance can be varied). Graph is plotted between potential difference (across acitor ) versus . Electric potential approaches on asymtote of 10 V as
The acitance of is equal to:
physics-General
physics-
acitor in the circuit is a variable acitor (its acitance can be varied). Graph is plotted between potential difference (across acitor ) versus Electric potential V1 approaches on . asymtote of 10 V as 
The acitance of the acitor C1 has value:
acitor in the circuit is a variable acitor (its acitance can be varied). Graph is plotted between potential difference (across acitor ) versus Electric potential V1 approaches on . asymtote of 10 V as
The acitance of the acitor C1 has value:
physics-General
physics-
Capacitor in the circuit is a variable capacitor (its capacitance can be varied). Graph is plotted between potential difference (across capacitor ) versus Electric potential approaches on asymtote of 10 V as
The electric potential V across the battery is equal to:
Capacitor in the circuit is a variable capacitor (its capacitance can be varied). Graph is plotted between potential difference (across capacitor ) versus Electric potential approaches on asymtote of 10 V as
The electric potential V across the battery is equal to:
physics-General
physics-
the figure shown 
In the surface charge density on the upper metallic plate
the figure shown In the surface charge density on the upper metallic plate
physics-General
