A long straight wire carries a current I. What is the direction of the magnetic field at a point located directly above the wire? (2020)

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Q: A long straight wire carries a current I. What is the direction of the magnetic field at a point located directly above the wire? (2020)

Solution: Using the right-hand rule, the magnetic field direction at a point above the wire is away from 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 away from the wire at that point.
Step 5: Conclude that the direction of the magnetic field at the point above the wire is away from the wire.