Question
If the vectors $\overrightarrow c ,\overrightarrow a = x\widehat i + y\widehat j + z\widehat k$ and $\widehat b = \widehat j$ are such that $\overrightarrow a ,\overrightarrow c $ and $\overrightarrow b $ form a right handed system then ${\overrightarrow c }$ is :