Two charge +3.2 x 10-19 C and -3.2 x 10-19 C placed 2.4A apart from an electric dipole. It is placed in a uniform electric field of intensity 4x105 volts/m. The electric dipole moment is ____.
7.68 x 10-29 C x m
7.68 x 10-19 C x m
15.36 x 10-29 C x m
15.36 x 10-29 C x m
Work done in moving an electric charge q in an electric field does not depend upon ____.
magnitude of the charge
potential difference between two points
mass of the particle
All the above
Ratio of the electrostatic to gravitational force between two electrons placed at a certain distance in air will be ____.
4.2 x1042
4.2 x 10-42
2.4 x 1024
2.4 x 10-24
I Me V is equal to ____.
1.6 x 10-19J
1.6 x 10-14J
1.6 x 10-13J
1.6 x 1013J
A suitable unit for expressing the strength of electric field is ____.
V/C
C/m
N/C
C/N
1 Vm-1 equals ____.
1 NC-1
1NC-2
1 Jm-1
1 Jm-2
Electric potential at the surface of an atomic nucleus (z =50) of radius 9x10-13 cm is ____.
80 volts
8 x 106 volts
9 volts
9 x 105 volts
Three charges –q, Q and –q are placed at equal distance on a straight line. If the total potential energy of the system of three charges is zero, then the ratio Q : q is ____.
1 :2
2 :1
1 : 1
1 : 4
If two electrons are separated by a distance of 0.5A, then ratio of coulomb force and weight of electron is approximately ____.
1016
1018
1020
1022
Two positively charged particles each of mass 1.7 x 10-27 kg and carrying a charged of 1.6 x 10-19 are placed at a distance r apart. If each one experiences a repulsive force equal to its weight, then r is ____.
1.17 m
1.71 m
0.117 m
0.171 m