Question

A magnetic field is produced by the current passing through a long straight wire. When will the strength of the magnetic field increase?

• A. When the magnitude of the current increases
• B. When the distance from the wire increases
• C. When the length of the wire increases
• D. When the thickness of the wire increases

Answer 1

The correct option is A

When the magnitude of the current increases

Strength of magnetic field can be increased by increasing the magnitude of the current in the wire. The strength decreases with distance from the wire. Length and thickness have no effect, if the current flowing through it remains the same