Physics-
General
Easy
Question
A charged ball B hangs from a silk thread S, which makes an angle 
with a large charged conducting sheet P, as shown in the figure. The surface charge density 
of the sheet is proportional to
The correct answer is:
and 
Þ 
Þ 
.
Related Questions to study
Physics-
To charges 
and 
are placed 
apart, shown in the figure. A third charge 
is moved along the arc of a circle of radius 40cm from C to D. The change in the potential energy of the system is 
, where k is
To charges and are placed apart, shown in the figure. A third charge is moved along the arc of a circle of radius 40cm from C to D. The change in the potential energy of the system is , where k is
Physics-General
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As per this diagram a point charge +q is placed at the origin O. Work done in taking another point charge -Q from the point 
[co-ordinates (0,a)] to another point B [co-ordinates (a, 0)] along the straight path AB is
As per this diagram a point charge +q is placed at the origin O. Work done in taking another point charge -Q from the point [co-ordinates (0,a)] to another point B [co-ordinates (a, 0)] along the straight path AB is
Physics-General
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Figure shows three points A, B and C in a region of uniform electric field 
. The line AB is perpendicular and BC is parallel to the field lines. Then which of the following holds good. Where 
and 
represent the electric potential at points A, B and C respectively
Figure shows three points A, B and C in a region of uniform electric field . The line AB is perpendicular and BC is parallel to the field lines. Then which of the following holds good. Where and represent the electric potential at points A, B and C respectively
Physics-General
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The points resembling equal potentials are
The points resembling equal potentials are
Physics-General
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Charges q, 2q, 3q and 4q are placed at the corners A, B, C and D of a square as shown in the following figure. The direction of electric field at the centre of the square is along
Charges q, 2q, 3q and 4q are placed at the corners A, B, C and D of a square as shown in the following figure. The direction of electric field at the centre of the square is along
Physics-General
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There are two equipotential surface as shown in figure. The distance between them is r. The charge of –q coulomb is taken from the surface A to B, the resultant work done will be
There are two equipotential surface as shown in figure. The distance between them is r. The charge of –q coulomb is taken from the surface A to B, the resultant work done will be
Physics-General
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The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0
cm is
The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 cm is
Physics-General
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A hollow conducting sphere is placed in an electric field produced by a point charge placed at P as shown in figure. Let 
be the potentials at points A,B and C respectively. Then
A hollow conducting sphere is placed in an electric field produced by a point charge placed at P as shown in figure. Let be the potentials at points A,B and C respectively. Then
Physics-General
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A drop of 
water carries 
charge. What electric field should be applied to balance its weight (assume 
A drop of water carries charge. What electric field should be applied to balance its weight (assume
Physics-General
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Three charges Q,(+q) and (+q) are placed at the vertices of an equilateral triangle of side l as shown in the figure. If the net electrostatic energy of the system is zero, then Q is equal to
Three charges Q,(+q) and (+q) are placed at the vertices of an equilateral triangle of side l as shown in the figure. If the net electrostatic energy of the system is zero, then Q is equal to
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Two small spherical balls each carrying a charge 
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between them, as shown in the figure. What is the tension in the threads (Given: 
)
Two small spherical balls each carrying a charge (10 micro-coulomb) are suspended by two insulating threads of equal lengths 1m each, from a point fixed in the ceiling. It is found that in equilibrium threads are separated by an angle between them, as shown in the figure. What is the tension in the threads (Given: )
Physics-General
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A charge (-q) and another charge (+Q) are kept at two points A and B respectively. Keeping the charge (+Q) fixed at B, the charge (-q) at A is moved to another point C such that ABC forms an equilateral triangle of side l. The net work done in moving the charge (-q) is
A charge (-q) and another charge (+Q) are kept at two points A and B respectively. Keeping the charge (+Q) fixed at B, the charge (-q) at A is moved to another point C such that ABC forms an equilateral triangle of side l. The net work done in moving the charge (-q) is
Physics-General
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In the rectangle, shown below, the two corners have charges 
and 
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)
In the rectangle, shown below, the two corners have charges and . The work done in moving a charge from B to A is (take )
Physics-General
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Figures below show regular hexagons, with charges at the vertices. In which of the following cases the electric field at the centre is not zero
Figures below show regular hexagons, with charges at the vertices. In which of the following cases the electric field at the centre is not zero
Physics-General
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In the given figure distance of the point from A where the electric field is zero is
In the given figure distance of the point from A where the electric field is zero is
Physics-General
