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?
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
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
The bob of a pendulum of mass 100 g is at equilibrium in a horizontal uniform electric field of 2.5 × 105 V m−1. In this equilibrium position, the pendulum makes an angle with the vertical. The amount of charge on the bob is 3 µC. Assume that the bob is suspended by means of a thin mass-less string. What will be the tension in the string when the bob is at equilibrium?
0.75 N
1.23 N
0.75 × 102 N
1.23 × 102 N
A positive charge q is placed at the centre of a cube. A side of the cube is 0.2 m. The electric flux through each Gaussian surface of the cube is 4.708 × 104 N m2 C−1. What is the value of charge q ?
1 μC
1.5 μC
2.5 μC
3 μC
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
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 charges of amount +5 µC and −5 µC are located 0.05 cm apart from each other form an electric dipole. The dipole is held at an angle of 60° in a uniform electric field of 2.1 × 105 N C−1. What is the value of the torque acting on the dipole ?
2.1 × 10−4 N m
4.5 × 10−4 N m
7.2 × 10−4 N m
9.1 × 10 -4 N 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
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
