Question

Two electric dipole each dipole of moment P are placed at 120° the net dipole

Answer 1

Answer:

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Explanation:

:

In fig. two dipole moments p1 along BA and p2 along DC act at an angle of 120∘. The resultant dipole moment is along OR

PR=p21+p22+2p1p2cos120∘−−−−−−−−−−−−−−−−−−−√

=p2+p2+2pp(−12)−−−−−−−−−−−−−−−−−√=p

As ∠AQR=60∘, therefore,

∠XQR=θ=90∘−60∘=30∘

τ=pEsinθ=pEsin30∘=pE/2

The direction of torque is perpendicular to p→andE→,i..e., perpendicular to plane of paper and outwards, Fig.