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.
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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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