A) \[\theta ={{90}^{o}}\]
B) \[\theta ={{120}^{o}}\]
C) \[\theta ={{150}^{o}}\]
D) \[\theta ={{180}^{o}}\]
Correct Answer: A
Solution :
The dipole moment of two dipoles inclined at an angle \[\theta \] is given by the equation \[\mu =\sqrt{{{X}^{2}}+{{Y}^{2}}+2XY\cos \theta }\] \[\cos 90{}^\circ =0\]. Since the angle increases from \[90-180\], the value of \[\cos \theta \] becomes more and more ? ve and hence resultant decreases. Thus, dipole moment is maximum when \[\theta =90{}^\circ \].
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