A electric dipole is placed at an angle of 30º to a nonuniform electric field.

Electric dipole moment, p = 4 × 10−9 C m Angle made by p with a uniform electric field, θ = 30° Electric field, E = 5 × 104 N C−1 Torque acting...

(a)  A force and a torque act on a magnetic needle kept in a nonuniform magnetic field.

(a) is always zero 

(d) The torque on the dipole due to the field may be zero.

The correct answer is aa(A) (C) (a) The flux of the electric field through the sphere is zero. (c) The electric field is not zero anywhere on the sphere.

(a) the charge crossing in a given time interval (d) free-electron density.

(i) In stable equilibrium the dipole moment is parallel to the direction of electric field (i.e., θ = 0).  (ii) In unstable equilibrium P.E. is maximum, so θ = π so...

P = 3 x 10-8cm ; E =104N/C  At stable equilibrium (θ1 ) = 0°  At unstable equilibrium (θ2) =180°  Work done in rotating dipole is given by:  W = PE (cosθ1 - cosθ2 )   =...

Dipole moment of an electric dipole is the product of either of charge and the length of dipole. It is a vector quantity. vector P = q(2vector a)

E = 2.5 × 104 P = 3.4 × 10–30 τ = PE sinθ = P × E × 1 = 3.4 × 10–30 × 2.5 × 104 = 8.5 × 10–26