D. circles around the wire that go in at the bottom
Explanation:
In order to determine the direction of the magnetic field around the wire, we should use the right's hand rule. First of all, let's keep in mind that the magnetic field around a current carrying wire consists of concentric circles around the wire, so the only possible options are C and D.
In the right-hand rule, we put our thumb in the same direction of the current (so, toward the right). Then we wrap all the other fingers of the hand around the thumb: the direction of the fingers give the direction of the magnetic field. In this case, the fingers go in at the bottom of the thumb (bottom of the wire), so the correct option is
D. circles around the wire that go in at the bottom
The magnetic field is shown by circles around the wire that go in at the bottom.
According to the law of electromagnetic induction, the motion that produces currengt is always opposite in direction to the current that is produced.
Hence, it follows that for a wire that has current flowing to the right, the magnetic field is shown by circles around the wire that go in at the bottom.
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