In a certain region of space, electric field is along the z-direction throughout. The magnitude of electric field is however not constant, but increases uniformly along the positive z-direction at the rate of 105 N C-1m-1 The force experienced by the system having a total dipole moment equal to 10-7 C m in the negative z-direction is
10-2 N
10-2 N
10-4 N
10-4 N
A.
10-2 N
Consider an electric dipole with -q charge at A and +q charge at B, placed along z-axis, such that its dipole moment is in negative z-direction.
i.e pz = 10-7 C m
The elecric field is along positive direction of z-axis, such that
= 105 N C-1 m-1
From F = qdE
= ( q × dz ) ×
F = p
Force experienced by the system in the negative z-direction,
F =
= 10-7 × ( 10-5 )
F = 10-2 N
