दिलेल्या इलेक्ट्रॉन ठिकाण संरचनेवरून हायड्रोजनचे ओळखा : \[ \begin{array}{c} H \quad H \\ \cdots \quad \cdots \\ H : C : C : H \\ \cdots \quad \cdots \\ H \quad H \end{array} \]
Study the entries in the following table and rewrite them by putting the connected items in the single row: 
Draw a neat labelled diagram of electric motor and write its principle. 