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1.
Two conducting spheres of radii 
and 
having charges 
and 
respectively are connected to each other. There is
and having charges and respectively are connected to each other. There is
2.
Kinetic energy of an electron accelerated in a potential difference of 
is
is
3.
A parallel plate capacitor of capacity 
is charged to a potential 
(i) The energy stored in the capacitor when the battery is disconnected and the separation is doubled
(ii) The energy stored in the capacitor when the charging battery is kept connected and the separation between the capacitor plates is doubled is
. Then 
E value is
is charged to a potential (i) The energy stored in the capacitor when the battery is disconnected and the separation is doubled
(ii) The energy stored in the capacitor when the charging battery is kept connected and the separation between the capacitor plates is doubled is
4.
Figures below show regular hexagons, which charges at the vertices. In which of the following cases the electric field at the centre is not zero
5.
A simple pendulum of period 
has a metal bob which is negatively charged. If it is allowed to oscillate above a positively charged metal plate, its period will
has a metal bob which is negatively charged. If it is allowed to oscillate above a positively charged metal plate, its period will
6.
Four point charges 
and 
are placed, one at each corner of the square. The relation between 
and 
for which the potential at the centre of the square is zero is
and are placed, one at each corner of the square. The relation between and for which the potential at the centre of the square is zero is
7.
Two equal charges are separated by a distance 
A third charge placed on a perpendicular bisector at 
distance will experience maximum coulomb force when
A third charge placed on a perpendicular bisector at distance will experience maximum coulomb force when
8.
The spatial distribution of the electric field due to charges (A, B) is shown in figure. Which one of the following statements is correct?
9.
Two identical conducting spheres carrying different charges attract each other with a force 
when placed in air medium at a distance 
apart. The spheres are brought into contact and then taken to their original positions. Now the two spheres repel each other with a force whose magnitude is equal to that of the initial attractive force. The ratio between initial charges on the spheres is
when placed in air medium at a distance apart. The spheres are brought into contact and then taken to their original positions. Now the two spheres repel each other with a force whose magnitude is equal to that of the initial attractive force. The ratio between initial charges on the spheres is
10.
A neutral water molecule (H2O) in its vapour state has an electric dipole moment of 
Cm. If the molecule is placed in an electric field of 
, the maximum torque that the field can exert on it is nearly
Cm. If the molecule is placed in an electric field of , the maximum torque that the field can exert on it is nearly