Question

06.ə) Write relation for torque acting on an elecinc dipole of dipole moment P placed in uniform elocinc field
E. Express it in vedor form and point out the direction along which it act.
(b) What will happen if the field is non-uniform?​

Answer 1

Explanation:

a) Force on charge +q=F

A

=q∈ along direction of vector ∈

Force on charge −q=F

B

=q∈ opposite to direction of

∈

As there two forces are equal, they from a couple

Torque(τ)=Force×Armofcouple

τ=F×ABsinθ

τ=q∈×ABsinθ

τ=q∈×2asinθ

τ=(q×2a)∈sinθ

τ=P∈sinθ,wherePindipolemovement

τ=P×∈