PH-341
Magnetic effect of a current
Physics · Secondary 3 · Medium · Magnetic effect of a current
In a long straight wire, the magnetic field strength at a fixed distance from the wire is directly proportional to the current. If the current is increased from 2 A to 6 A, what happens to the magnetic field strength at that distance?
- It becomes three times as large.
- It stays the same.
- It becomes half as large.
- It becomes one‑third as large.
Sign in to check your answer and see the hint and the worked explanation. Free on PrepLab High.