Electric Field Practice Level - 1 - Class 12 MCQ

An electron initially at rest falls a distance of 1.5 cm in a uniform electric field of magnitude 2 × 10⁴ N/C. The time taken by the electron to fall this distance is

The electric field created by a point charge falls with distance r from the point charge as  

The electric field at the centroid of an equilateral triangle carrying an equal charge q at each of the vertices is

A particle of mass m carrying charge q is kept at rest in a uniform electric field E and then released. The kinetic energy gained by the particle, when it moves through a distance y is

The charge q is projected into a uniform electric field E, work done when it moves a distance Y is

If the linear charge density of a cylinder is 4 μCm^-1 then electric field intensity at point 3.6 cm from axis is

A simple pendulum has a length l and the mass of the bob is m. The bob is given a charge q coulomb. The pendulum is suspended between the vertical plates of a charged parallel plate capacitor. If E is the electric field strength between the plates, the time period of the pendulum is given by

Charges +2q +q and +q are placed at the corners A, B and C of an equilateral triangle ABC. If E is the electric field at the circumcentre O of the triangle, due to the charge +q, then the magnitude and direction of the resulatant electric field at O is

Which of the following configurations of electric lines of force is not possible?

Two unlike charges of the same magnitude Q are placed at a distance d. The intensity of the electric field at the middle point in the line joining the two chages.

The spatial distribution of the electric field due to charges (A, B) is shown in figure. Which one of the following statements is correct?

Two point charges +8q and -2 q are located at x = 0 and x = L respectively, The location of a point on the x-axis at which the net electric field due to these two point charges is zero is

Six charges, three positive and three negative of equal magnitude are to be placed at the vertices of a regular hexagon such that the electric field at O is double the electric field when only one positive charge of same magnitude is placed at R. Which of the following arrangements of charges is possible for P, Q, R, S, T and U respectively?

The electric field at a point due to an electric dipole, on an axis inclined at an angle θ (< 90⁰) to the dipole axis, is perpendicular to the dipole axis, if the angle θ  is

A dipole of electric dipole moment p is placed in a uniform electric field of strength E. If θ  is the angle between positive directions of p and E, then the potential energy of the electric dipole is largest when θ is

Let E_a be the electric field due to a dipole in its axial plane distancei and let E_q be the field in the equatorial plane distancei ,then the relation between E_a and E_q will be

The relation between the intensity of the electric field of an electric dipole at a distanec r from its centre on its axis and the distance is when (r >> 2t)

An electric dipole of the dipole moment p is placed in a uniform electric field E. The maximum torque experienced by the dipole is

Torque acting on an electric dipole in a uniform electric field is maximum if the angle between p and E is

An electric dopole of length 1 cm is placed with the axis making an angle of 30⁰ to an electric field of strength 10⁴NC^-1. If it experiences a torque of 10√2 Nm, the potential energy of the dipole is

If the force exerted by an electric dipole on a charge q at a distance of 1 m is F, the force at a point 2 m away in the same direction will be

Dipole is placed parallel to the electric field. If Q is the work done in rotating the dipole by 60⁰, then work done in rotating it by 180⁰ is