The electric flux through a closed gaussian surface depends upon (A) Permittivity of the medium. (B) Net charge enclosed only. (C) Net charge enclosed and permittivity of the medium. (D) Net charge enclosed, shape and size of the Gaussian surface and permittivity of the medium.

What is the angle between the electric dipole moment and electric field strength due to it on the axial line? (A) \(0^\circ\) (B) \(90^\circ\) (C) \(180^\circ\) (D) None of these

Which of the following statements is not true about Gauss’s law? (A) Gauss’s law is true for any closed surface. (B) The term q on the right side of Gauss’s law includes the sum of all charges enclosed by the surface. (C) Gauss’s law is not much useful in calculating electrostatic field when the system has some symmetry. (D) Gauss’s law is based on the inverse square dependence on distance contained in the coulomb’s law.

Which of the following is not a property of electric field lines? (A) Field lines are closed and continuous curves without any breaks. (B) Two field lines cannot cross each other. (C) Field lines start at positive charges and end at negative charges. (D) They do not form closed loops.

Select the correct statements from the following (i) inside a charged or neutral conductor, electrostatic field is zero. (ii) the electrostatic field at the surface of the charged conductor must be tangential to the surface at any point. (iii) there is no net charge at any point inside the conductor. (A) (i) and (ii) (B) i) and (iii) (C) (ii) and (iii) (D) (i), (ii), and (iii)

The charges on two spheres are +7mC and –5mC respectively. They experience a force F. If each of them is given an additional charge of –2mC, the new force of attraction will be

When 2 × \(10^{11}\) electrons are removed from a neutral metal sphere, the charge on the sphere becomes: (A) -16 nC (B) 16 nC (C) -32 nC (D) 32nC

Three charges each equal to 2 μC are placed at the corners of an equilateral triangle. If force between any two charges is 2F, then the net force on either will be:

Electric flux emanating through a surface element placed in an electric field is (A) 10 units (B) 20 units (C) 4 units (D) 16 units

A charge q is placed at one corner of the cube. The electric flux passing through any one of its face is

Cathode rays travelling from west to east enter into region of electric field directed towards south to north in the plane of paper. The deflection of cathode rays is towards: (A) East (B) West (C) North (D) South

In the figure the net electric flux through the area... when the system is in air. On immersing the system in water,the net electric flux through the area

Two-point charges 2μC and 4μC are placed 2 cm apart. The ratio of the Coulomb’s force experienced by them is (A) 1: 2 (B) 2: 1 (C) 1: 1 (D) 4: 1

The given figure shows tracks of three charged particles in a uniform electrostatic field. Which of them is probably an α-particle? (A) 1 (B) 2 (C) 3 (D) None of the above

A tiny spherical oil drop carrying a net charge q is balanced in still air with a vertical uniform electric field strength 81/7 x 10⁵ Vm⁻¹. When the field is switched off, the drop is observed to fall with terminal velocity 2 x 10⁻³ ms⁻¹, given g = 9.8 ms⁻², viscosity of the air = 1.8 x 10⁻⁵ Nsm⁻², and the density of oil = 900 kgm⁻¹. The magnitude of q is. (A) 1.6 x 10⁻¹⁹ C (B) 3.2 x 10⁻¹⁹ C (C) 4.0 x 10⁻¹⁹ C (D) 8.0 x 10⁻¹⁹ C