1. $$\omega \left( {{{\text{r}}_1}{{\text{r}}_2}} \right)\sin \theta $$
  2. $$\omega \left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)\sin \theta \sec 2\theta $$
  3. $$\omega \left( {{{\text{r}}_1}{{\text{r}}_2}} \right)\cos \theta $$
  4. $$\omega \left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)\cos \theta \,{\text{cosec2}}\theta $$
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Answer: Option 2

Let'

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