Magnetic fields due to currents

Need to know

What you need to know

• A current-carrying wire produces a magnetic field consisting of concentric circles.
• The direction of the field is given by the Right-Hand Grip Rule.
• Field strength is directly proportional to the current ($B \propto I$).
• Field strength is inversely proportional to the perpendicular distance from the wire ($B \propto 1/r$).

Explanation

Magnetic fields due to currents

1. A current-carrying wire produces a magnetic field consisting of concentric circles.
2. The direction of the field is given by the Right-Hand Grip Rule.
3. Field strength is directly proportional to the current ($B \propto I$).
4. Field strength is inversely proportional to the perpendicular distance from the wire ($B \propto 1/r$).