An electric dipole has a pair of equal and opposite point charges q and -q separated by a distance 2x. The axis of the dipole is defined as
The electric field intensity E, due to an electric dipole of moment p, at a point on the equatorial line is
An electric dipole is placed at an angle of 30° to a nonuniform electric field. Th dipole will experience
An electric dipole of moment p is placed at the origin along the x-axis. The electric field at a point P, whose position vector makes an angle q with the x-axis, will make an angle. With the x-axis, where
An electric dipole is situated in an electric field of uniform intensity E whose dipole moment is p and moment of inertia is I. If the dipole is displaced slightly from the equilibrium position, then the angular frequency of its oscillations is
Two particles of masses in the ratio 1 : 2 with charges in the ratio 1 : 1, are placed at rest in a uniform electric field. They are relased and allowed to move for the same time. The ratio of their kinetic energies will be finally
An α particle is situated in an electric field of strength 15 × 104 NC-1. Force acting on it is
A point charge of 100 µC is placed at 3iˆ + 4 ˆj m. Find the electric field intensity due to this charge at a point located at 9iˆ + 12 ˆj m.
An oil drop, carrying six electronic charges and having a mass of 1.6 × 10-12 g, falls with some terminal velocity in a medium. What magnitude of vertical electric field is required to make the drop move upwards with the same speed as it was formerly moving downwards with?Ignore buoyancy.
Five point charges, +q each, are placed at the five vertices of a regular hexagon. The distance of centre of the hexagon from any of the vertices is a. The electric field at the centre of the hexagon is
A ring of charge with radius 0.5 m has 0.002 π m gap. If the ring carries a charge of +1 C, the electric field at the centre
If an electron has an initial velocity in a direction different from that of a uniform electric field, the path of the electron is
A point charge q1 is moved along a circular path of radius r in the electric field of another point charge q2 at the centre of the path. The work done by the electric field on the charge q1 in half revolution is
Four identical charges Q are fixed at the four corners of a square of side a. The electric field at a point P located symmetrically at a distance from the centre of the square is
A thin glass rod is bent into a semicircle of radius r. A charge +Q is uniformly distributed along the upper half and charge -Q is uniformly distributed along the lower half. The electric field E at P, the centre of the semicircle is
Find the electric field vector at P (a, a, a) due to three infinitely long lines of charges along the x-,y- and z-axes, respectively. The charge density, i.e,. charge per unit length of each wire is λ.
The unit of electric field is not equivalent to
Electric intensity at a point varies as r-1 for
The force between two short electric dipole separated by a distance r varies as
An electric field can deflect
Electrons, others are changeless.
The magnitude of electric field strength E such that an electron placed in it would experience an electrical force equal to its weight, is given by
A thin conducting ring of radius R is given a charge + Q. The electric field at the centre O of the ring due to charge on the part AKB is E. The electric field at the centre due to the charge on the part ACDB of the ring is :
If electric field is uniform, then the electric lines of forces are
If electric field is uniform the lines will be parallel.
Six charges +Q each are placed at the corners of a regular hexagon of side α. The electric field at the centre of hexagon is :
will be zero, as all vectors cancel out each other.
The electric dipole is situated in an electric field as shown in fig. The dipole and electric field are both in the plane of the paper. The dipole is rotated about an axis perpendicular to plane of paper passing through A in anticlockwise direction. If the angle of rotation (θ) is measured with respect to the direction of electric field, then the experienced by the dipole for dif f ere nt values of the angle of rotat ion q will be represented in fig. (b) by curve
z = pE sin θ