If a long straight wire carries a current I, what is the direction of the magnetic field at a point located directly above the wire?

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Q: If a long straight wire carries a current I, what is the direction of the magnetic field at a point located directly above the wire?

Solution: Using the right-hand rule, the magnetic field at a point directly above the wire is directed counterclockwise around the wire.

Steps: 5

Step 1: Identify the direction of the current in the wire. Let's say the current is flowing upwards.
Step 2: Use your right hand to apply the right-hand rule. Point your thumb in the direction of the current (upwards).
Step 3: Curl your fingers around the wire. Your fingers will show the direction of the magnetic field lines.
Step 4: Look at the point directly above the wire. Your fingers will be pointing in a counterclockwise direction around the wire.
Step 5: Conclude that the magnetic field at the point directly above the wire is directed counterclockwise.