An electric dipole of moment $\overrightarrow p $ placed in a uniform electric field $\overrightarrow E $ has minimum potential energy when the angle between $\overrightarrow p $ and $\overrightarrow E $ is
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(a) $U = - PE\cos \theta $
It has minimum value when $\theta = 0^o$
i.e. ${({U_P})_{\min }} = - PE \times \cos {0^o} = - PE$
It has minimum value when $\theta = 0^o$
i.e. ${({U_P})_{\min }} = - PE \times \cos {0^o} = - PE$
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