An ion with a charge of+ is trapped in the earth's magnetic field. It suddenly picks up 2 electrons, and its charge becomes -1. How does its motion change? Assume the gain of the 2 electrons does not involve a mechanical force.
A. It reverses direction along the same spiral path.
B. It travels along the same spiral path at a greater speed.
C. It travels along the same spiral path at a lesser speed.
D. The rotation of its spiral path reverses direction.

D. The rotation of its spiral path reverses direction.

Explanation:

F = qvB (eq. 1)

where,

q = charge

v = velocity of the particle

B = strength of the magnetic field

 (eq. 2)

Where,

m = mass of the particle

r = radius of the orbit

i don't know that i agree with that but what's the question ?

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force