The magnetic field of a current: wires and solenoids

你需要知道的

• A current-carrying wire produces a magnetic field whose direction reverses when the current reverses.
• Use the right-hand grip rule to relate conventional current to field direction.
• A solenoid produces a strong, approximately uniform field inside the coil.
• Increasing the current or turns per unit length, or adding an iron core, strengthens the solenoid’s field.

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