1.
If an electric dipole is placed in non-uniform electric field, then
2.
The net electric field at equatorial position at distance r from the centre of a dipole is
3.
The electric field due to an infinite line charge at distance r is
4.
Indentify the incorrect option
5.
Two point charges -q and +q/2 are situated at the origin and at the point (a,0,0) respectively. The point along x-axis where the electric field vanishes is:
6.
Charges q, 2q, 3q and 4q are placed at the corners A, B, C and D of a square as shown in the following figure.The direction of electric field at the centre of the square is along:
7.
Three identical point charges, as shown,are placed at the vertices of an isosceles right angled triangle. Which of the numbered vectors coincides in direction with the electric field at the mid-point of the hypotenuse?
8.
Electric flux through a surface of area 10 m² lying in the x-y plane,if vector E =i ̂+√2 j ̂+√3 k ̂ N/C, is
9.
A charge q is placed at the centre of the open end of cylindrical vessel.The flux of the electric field through the surface of the vessel is:
10.
Two spherical conductors B and C having equal radii and carying equal charges in them repel each other with a force F when kept apart at some distance. A third spherical conductor having the same radius as that of B but uncharged is brought in contact with B, then with C and finally removed away from both. The new force of repulsion between B and C is
11.
Two charges + 4 e and + e are at distance x apart. At what distance, a charge q must be placed from charge +e so that it is in equilibrium?
12.
Two equal negative charges -q are fixed at points (0, a) and (0, -a) on the y-axis. A positive charge Q is released from rest at the point (2a, 0) on the x-axis. The charge Q will
13.
Two electric dipoles of moment P and 64 P are placed in opposite direction on a line at a distance 25 cm. The electric field will be zero at points between the dipoles whose distance from the dipole of moment P is:
14.
Consider two thin uniformly charged concentric shells of radii r and 2r having charges q and -q respectively, as shown. Three points A, B and C are marked at distances r/2, 3r/2 and 5r/2 respectively from their common centre. If E₁, E₂ and E₃ are magnitudes of electric fields at points A, B and C respectively then
15.
Four charges each equal to -Q are placed at the four corners of a square and a charge q is at its centre. If the system is in equilibrium, the value of q is:
16.
Two point charges =4q and +q are placed at a distance L apart. A third charge Q is so placed that all three charges are in equilibrium. Then location and magnitude of third charge will be
17.
Two infinite plane sheet A and B are parallel to each other and separated by some distance apart. The surface charge densities on A and B are (2/π) × 10⁻⁹ C/m² and (-1/π) × 10⁻⁹ C/m² respectively. The electric field at a point between the two plates at point C is:
18.
A charge Q is placed at each of the two opposite corners of a square. A charge q is placed at each of the other two corners. If the net electrical force on Q is zero, the Q/q equals
19.
When air is replaced by a dielectric medium of dielectric constant k, the maximum force of attraction between two charges separated by a distance
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