Answer
The direction of $~~d_1 \times \frac{d_2}{4}~~$ is in the positive direction of the z axis.
Work Step by Step
Vector $d_1$ is in the negative direction of a y axis.
Vector $\frac{d_2}{4}$ is in the positive direction of an x axis.
According to the right hand rule, the direction of $~~d_1 \times \frac{d_2}{4}~~$ is in the positive direction of the z axis.
