Because the magnetic field created by moving a current through a wire is both parallel and perpendicular to the wire, the field strength can be improved by coiling the wire, therefore the correct answer is option A.
What is a magnetic field?
A magnetic field could be understood as an area around a magnet, magnetic material, or an electric charge in which magnetic force is exerted.
because coiling the wire can increase the magnetic field's intensity because the magnetic field produced by running a current through a wire is both parallel to and perpendicular to the wire.
Thus, the correct answers are parallel and coiling respectively, therefore the correct answer is option A.
Learn more about the magnetic fields from here, refer to the link;
brainly.com/question/23096032
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