Electric Currents, Magnetic Field & Ampere’s Law

The magnetic field around a long straight wire is:

• Linear

• Radial

• Circular

• Straight

According to Ampere’s Law, the magnetic field around a straight current-carrying wire is:

• Proportional to the voltage

• Inversely proportional to distance from the wire

• Always pointing outward

• Constant everywhere

A current of 5 A flows through a wire. What happens to the magnetic field if the current is doubled?

• It becomes half

• It remains unchanged

• It doubles

• It becomes four times

Which of the following is true about the direction of magnetic field produced by a straight current-carrying conductor?

• It depends on the shape of the conductor

• It follows Fleming’s Left Hand Rule

• It follows the Right-Hand Thumb Rule

• It follows Lenz’s Law

Which of the following increases the magnetic field around a wire?

• Decreasing current

• Increasing distance

• Increasing current

• Shortening the wire