Due to the earth’s magnetic field, charged cosmic ray particles

Solution :
Earth's magnetic field at poles is vertical (perpendicular to the earth's surface) and horizontal (parallel to the earth’s surface) at equator.
Cosmic rays are positively charged particles and its velocity is parallel to the earths magnetic field. So, no magnetic force acts on cosmic ray particles coming at poles, i.e. force
$$\left( F \right) = qvB\sin \theta $$
At poles angle between $$v$$ and $$B$$ is $$\theta = {0^ \circ },$$
So, $$F = 0$$
At equator $$\theta = {90^ \circ },$$
So, $${\text{Force}} = qvB\sin {90^ \circ } = qvB$$
This force is maximum and deflects the particles sideways.
Hence, only high energy particles can reach the equator.