1. When the wire's current rises from 5 A to 10 A, the strength of its magnetic field doubles
Explanation: The power of the magnetic field produced by a wire with a current flowing through it can be expressed as:
where 
signifies the permeability of free space, I denotes the current through the wire, and r represents the distance from it.
Observing the equation, we find that the magnetic field's intensity directly increases with the current: thus when the current goes from 5 A to 10 A, it is effectively doubling the magnetic field as well.
2. When the distance from the wire to the charged particle changes from 10 cm to 20 cm, the strength of the magnetic field reduces by half
Explanation: The intensity of the magnetic field created by a wire carrying a current is also given as:
This shows that the magnetic field decreases proportionally with the distance from the wire (r). In this scenario, as the distance from 10 cm to 20 cm is doubled, the result is that the field's strength will drop to half the original value.
3. The direction of the force changes
Explanation: The force experienced by a charged particle within a magnetic field is calculated by:
where q is the charge, v is the particle's velocity, B indicates the strength of the magnetic field, and 
defines the angle between v and B's direction. If the particle's charge switches from 2 µC to –2 µC, the magnitude of the force remains stable (due to the absolute value of q being unchanged), but since q gains a negative sign (-), the force's sign also flips, resulting in the force changing direction.
