Physics-
General
Easy
Question
Electric field given by the vector 
is present in the XY plane. A small ring carrying charge +Q, which can freely slide on a smooth non conducting rod, is projected along the rod from the point (0, L) such that it can reach the other end of the rod. What minimum velocity should be given to the ring? (Assume zero gravity)
The correct answer is:
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physics-
The diagram shows a small bead of mass m carrying charge q. The bead can freely move on the smooth fixed ring placed on a smooth horizontal plane. In the same plane a charge +Q has also been fixed as shown. The potential a the point P due to +Q is V. The velocity with which the bead should projected from the point P so that it can complete a circle should be greater than
The diagram shows a small bead of mass m carrying charge q. The bead can freely move on the smooth fixed ring placed on a smooth horizontal plane. In the same plane a charge +Q has also been fixed as shown. The potential a the point P due to +Q is V. The velocity with which the bead should projected from the point P so that it can complete a circle should be greater than
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physics-General
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A bullet of mass m and charge q is fired towards a solid uniformly charged sphere of radius R and total charge + q. If it strikes the surface of sphere with speed u, find the minimum speed u so that it can penetrate through the sphere. (Neglect all resistance forces or friction acting on bullet except electrostatic forces)
A bullet of mass m and charge q is fired towards a solid uniformly charged sphere of radius R and total charge + q. If it strikes the surface of sphere with speed u, find the minimum speed u so that it can penetrate through the sphere. (Neglect all resistance forces or friction acting on bullet except electrostatic forces)
physics-General
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An infinite number of concentric rings carry a charge Q each alternately positive and negative. Their radii are 1, 2, 4, 8...... meters in geometric progression as shown in the figure. The potential at the centre of the rings will be
An infinite number of concentric rings carry a charge Q each alternately positive and negative. Their radii are 1, 2, 4, 8...... meters in geometric progression as shown in the figure. The potential at the centre of the rings will be
physics-General
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If the electric potential of the inner metal sphere is 10 volt & that of the outer shell is 5 volt, then the potential at the centre will be :
If the electric potential of the inner metal sphere is 10 volt & that of the outer shell is 5 volt, then the potential at the centre will be :
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Potential difference between centre & the surface of sphere of radius R and uniform volume charge densityr within it will be :
Potential difference between centre & the surface of sphere of radius R and uniform volume charge densityr within it will be :
physics-General
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A small particle of mass m and charge –q is placed at point P and released. If R >> x, the particle will undergo oscillations along the axis of symmetry with an angular frequency that is equal to
A small particle of mass m and charge –q is placed at point P and released. If R >> x, the particle will undergo oscillations along the axis of symmetry with an angular frequency that is equal to
physics-General
physics-
The direction (q) of 
at point P due to uniformly charged finite rod will be
The direction (q) of at point P due to uniformly charged finite rod will be
physics-General
physics-
The charge per unit length of the four quadrant of the ring is 
respectively. The electric field at the centre is
The charge per unit length of the four quadrant of the ring is respectively. The electric field at the centre is
physics-General
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Six charges are placed at the corner of a regular hexagon as shown. If an electron is placed at its centre O, force on it will be:
Six charges are placed at the corner of a regular hexagon as shown. If an electron is placed at its centre O, force on it will be:
physics-General
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Four charges are arranged at the corners of a square ABCD, as shown. The force on a +ve charge kept at the centre of the square is
Four charges are arranged at the corners of a square ABCD, as shown. The force on a +ve charge kept at the centre of the square is
physics-General
chemistry-
All the boron trihalides except B may be prepared by direct reaction between the elements Boron trihalides consist of trigonal - planar BX3 molecules Unlike the halides of the other elements in the group they are monomeric in the gas, liquid and Sol. id states, BF3 and BCl3 are gases, BBr3 3Iis a volatile liquid and B is a Sol. Id Boron trihalides are Lewis acids because they form simple Lewis complexes with suitable bases, as in the reaction : 
However, boron chlorides, bromides and iodides are susceptible (sensitive) to protoly sis by mild proton sources such as water, alcohols and even amines; for example BCl3 undergoes rapid hydrolysis: 
It is supposed that the first step in the above reaction is the formation of the complex 
which then eliminates HCl and reacts further with water
Which of the following is the correct prediction about observed B–X bond length, in BX3 molecules ?
All the boron trihalides except B may be prepared by direct reaction between the elements Boron trihalides consist of trigonal - planar BX3 molecules Unlike the halides of the other elements in the group they are monomeric in the gas, liquid and Sol. id states, BF3 and BCl3 are gases, BBr3 3Iis a volatile liquid and B is a Sol. Id Boron trihalides are Lewis acids because they form simple Lewis complexes with suitable bases, as in the reaction : However, boron chlorides, bromides and iodides are susceptible (sensitive) to protoly sis by mild proton sources such as water, alcohols and even amines; for example BCl3 undergoes rapid hydrolysis: It is supposed that the first step in the above reaction is the formation of the complex which then eliminates HCl and reacts further with water
Which of the following is the correct prediction about observed B–X bond length, in BX3 molecules ?
chemistry-General
chemistry-
Statement-1 : Xenon forms fluorides
Statement-2 : 5 d-orbitals are available in xenon for valence shell expansion
Statement-1 : Xenon forms fluorides
Statement-2 : 5 d-orbitals are available in xenon for valence shell expansion
chemistry-General
chemistry-
Statement-1 : H3PO2 is a weak monobasic acid and is also strong reducing in nature
Statement-2 : 
Statement-1 : H3PO2 is a weak monobasic acid and is also strong reducing in nature
Statement-2 :
chemistry-General
chemistry-
Statement-1 : Electrovalency of oxygen is two (O2-)
Statement-2 : Dinegative anion of oxygen (O2-) is quite common but dinegative anion of sulphur (S2-) is less common
Statement-1 : Electrovalency of oxygen is two (O2-)
Statement-2 : Dinegative anion of oxygen (O2-) is quite common but dinegative anion of sulphur (S2-) is less common
chemistry-General
