The current in a wire increases from 5 A to 10 A, what happens to its magnetic field?
The field is twice as strong
the distance of a charged particle from a wire changes from 10 cm to 20 cm, what happens to its magnetic field?
the charge of a particle changes from 2 uC to -2C, what happens to the force exerted on that particle?

The first one is twice as strong

The second one is half as strong

The third one is the force is reversed

Explanation: just did it

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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