Question

Due to earth's magnetic field charged cosmic rays

• A. Requires more kinetic energy to reach the equator than the pole
• B. Can never reach the pole
• C. Requires less kinetic energy to reach the equator than the pole
• D. Can never reach equator

Answer 1

The correct option is A

Requires more kinetic energy to reach the equator than the pole

The explanation for the correct option:

In the case of option A,

1. Cosmic rays ionize the radiation. These cosmic rays are deflected by the earth's magnetic field and environment. This same magnetic field of the Earth deflects charged particles in cosmic rays.
2. This same amount of deflection is determined by the particle's momentum but also charge. Low energy ones cannot enter the atmosphere.

We know that,

$\mathrm{F}=\mathrm{Bqv}$

Here,

$F$ is the force on a charged object in a magnetic field depends on the strength of the magnetic field.

$B$ is the magnetic field.

$q$ is the charge.

$v$ is the velocity.

1. The magnetic field of the earth is the strongest at the poles. Due to this charges of cosmic rays get deflected away from the equator.
2. To reach close to the equator, cosmic ray particles need more incredible kinetic energy.
3. Hence, due to the earth's magnetic field-charged cosmic rays; particle requires more kinetic energy to reach the equator than the pole.

Therefore, option A is the correct answer.