The lines of forces due to charged particles are
always straight
always curved
sometimes curved
none of the above
The force between two charges is 120N. If the distance between the charges is doubled, then the force will be
60N
30N
40N
15N
The comb (rubbed on dry hair) attract small pieces of papers and this process is due to
Paper is a good conductor
Paper is an insulator
Both a and b
None of these
The ability of charged bodies to exert force on one another is attributed to the existence of
electrons
protons
neutrons
electric field
If we place an electric dipole S in a uniform electric field W. The dipole has minimum potential energy when angle between S and W in degrees will be
30
70
90
Zero
If we merged 125 spherical mercury droplets having 2.5 V potential of each mercury droplet. What will be the potential of entire droplets will be?
0.1 V
1.0 V
62.5 V
4 V
v' = n v
given, n= 125
therefore, 125 = 25
that is, v' = 25 * 2.5 = 62.5
If a person brings an electron towards another electron then the change in potential energy of the entire system will be
Increases
Half
Decreases
Reduces to zero
If a charge of 1 micro coulomb is divided into 2 parts in ratio 2:3 and placed 1 m apart in the vacuum. What will be the electric forces acting between in Newton?
0.00216
216.0
0.216
0.0216
If 4 point charges each +c is placed on the circumference of a circle of the diameter 2S if such a way that position of these 4 charges form a square on the circumference of the circle. Then, what is the potential at the center of the circle?
4c / S
0
3c/S
S / 4c
Four condensers are joined as shown in the adjoining figure. The capacity of each is4μF. The equivalent capacity between the points A and B will be
8μF
16μF
20μF
24μF
Four capacitors of each of capacity 3μFare connected as shown in the adjoining figure. The ratio of equivalent capacitance between A and B and between A and C will be
4:3
3:4
2:3
3:2
its wrong the option should be first one
Find the distance of the point from the charge of potential and field strength at that point is 600 V and 200 N/C.
6 m
7 m
3.5 m
3 m
Consider the charge configuration and a spherical Gaussian surface as shown in the figure. When calculating the flux of the electric field over the spherical surface, the electric field will be caused due to
all the charges
only the +ve charges
Consider a parallel plate capacitor of 8μF (micro-farad) with air filled in the gap between the plates. Now one half of the space between the plates is filled with a dielectric of dielectric constant 4, as shown in the figure. The capacity of the capacitor changes to
8μF
16μF
20μF
24μF
A parallel plate capacitor is charged and the charging battery is then disconnected. If the plates of the capacitor are moved further apart by means of insulating handles, then
the charge on the capacitor increases
the voltage across the plates decreases
the capacitance increases
the electrostatic energy stored in the capacitor increases
A capacitor stores 0.24 C at 10V . Its capacitance is
0.024F
2.4F
0.12F
0.8F