The electric field intensity vector in a region of space is given by The electric flux through a surface area of 50 m2 in x−y plane is
100 N m2 C−1
150 N m2 C−1
200 N m2 C−1
450 N m2 C−1
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 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
Three charges are placed at the vertices of an equilateral triangle of side 0.2 m, as shown in the given figure. What is the magnitude of the net Coulomb force acting on charge q1 due to the other two charges?
2.26 N
3.92 N
4.52 N
7.47 N
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 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
Four charges q, 2q, 3q and 4q are located at the vertices of a square of side a (as shown in the given figure). k is the electrostatic constant. What is the sum of the magnitude of forces exerted on each charge?
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
What is the force between an electron and an alpha particle separated by a distance 2 Å?
5.76 × 10−9 N of attractive nature
5.76 × 10−9 N of repulsive nature
11.52 × 10−9 N of attractive nature
11.52 × 10−9 N of repulsive nature