B) A magnetic field is created around the wire.
This idea is one of the fundamental ideas of physics - an electric current has a magnetic field, whether it's moving through a wire or space.
Acceleration of the ball is 
Explanation:
The acceleration of the ball can be found by using Newton's second law of motion, which states that the net force acting on an object is equal to the product between the mass of the object and its acceleration:

where
F is the net force
m is the mass
a is the acceleration
For the ball in this problem, we have
m = 0.50 kg (mass)
F = 25 N (force)
thereofre, the acceleration of the ball is

Learn more about Newton's second law:
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