A particle is moving with velocity $\hat i+ 3\hat j$ and it produces an electric field $2\hat k$ at a point. It will produce magnetic field at that point equal to

Question

$\begin {array} {1 1} (a)\;6\hat i - 2\hat j / c^2 & \quad (b)\;6\hat i + 2\hat j / c^2 \\ (c)\;Zero & \quad (d)\;Cannot\: be\: determined\: from\: the\: given\: data \end {array}$