A charge experiences a force of 32 N as it is placed at a certain distance on the axial line of an electric dipole.What will be the force on the charge if its distance from the dipole is halved?
64 N
128 N
256 N
512 N
Two thin metal plates are placed close to each other. On the inner side, both plates have a surface charge density of 2.9 × 10−11 C m−2, but of opposite nature. Between the plates, what is the electric force exerted in per unit area ?
5.5 × 10 -11 N/m2
9.5 × 10 -11 N/m2
5.5 × 10 -12 N/m2
9.5 × 10 -12 N/m2
An electron accelerated through 30-kV, in a cathode ray oscilloscope, enters a system of deflecting plates. The deflecting field between the plates is 24 kV m−1. The length of the deflecting plates is 0.06 m and the total deflection produced in the path of the electron on a screen is 9 mm.What is the distance of the screen from the near end of the plates?
0.35 m
0.38 m
0.40 m
0.45 m
Two point charges +1.5 µC and −0.5 µC are located 1 m apart. There is a point P on the line joining the charges where the net potential is zero. What is the distance of point P from charge +1.5 µC ?
0.50 m
0.75 m
0.25 m
Two charged balls are suspended from a hinge by two threads of equal lengths. Mass of both the balls is 200 g. The amount of charges on both the balls is the same. At translational equilibrium, the balls are separated by a distance of 0.8 m, as shown in the given figure. What is the magnitude of charge on each ball?
4.33 µC
8.97 µC
17.16 µC
34.48 µC
There are three charges, , placed along a straight line of length 10 m, as shown in the given figure.
What is the net electrostatic force acting on charge q2?
12 × 10−3 N towards q1
28.5 × 10−3 N towards q1
12 × 10−3 N towards q3
28.5 × 10−3 N towards q3
Two charges, +2 µC and +8 µC, are placed 0.1 m apart. Another charge is placed between the two, which brings the system in equilibrium.What is the magnitude of the third charge?
0.75 µC
0.87 µC
2.50 µC
1.25 µC
An electron is held freely by the application of a uniform electric field directed vertically upwards.What is the magnitude of the electric field that is balancing the electron?
2.34 × 10−11 N C−1
3.62 × 10−11 N C−1
4.21 × 10−11 N C−1
5.58 × 10−11 N C−1
Two charged particles are located at a distance of 1.5 m. The force of attraction between the charges is 2.1 × 10−7 N. One particle has a charge equal to two thirds the charge of another particle. What is the value of charges on the two particles?
Two positively charged particles, each carrying a charge of 3.6 × 10−8 C and having the same mass, are located at a distance of 0.1 m away from each other. If the electrostatic force on one of the charges is equal to its weight, then the mass of the system is :
1.019 g
1.182 g
0.854 g
0.238 g
