Magnetic Fields and Current Interaction

How was the Biot-Savart Law primarily determined?

• Through mathematical derivation.

• Through experimental observation.

• Through theoretical prediction.

• Through philosophical reasoning.

What does the Biot-Savart Law describe regarding a current-carrying wire?

• The electric field produced by a stationary charge.

• The magnitude and direction of an infinitesimal magnetic field.

• The force between two charged particles.

• The resistance of a wire to current flow.

What fundamental phenomenon causes a magnetic field?

• Stationary electric charges.

• Insulating materials.

• Individually moving electric charges.

• The presence of a vacuum.

What is the direction of the magnetic field (dB) caused by a current (I) flowing to the right in a wire, at a point directly above the wire?

• Into the screen

• Out of the screen

• To the left

• To the right

How does the magnitude of the infinitesimal magnetic field (dB) change as the distance (r) from the current-carrying wire increases?

• It increases proportionally to r.

• It decreases proportionally to r.

• It increases proportionally to r squared.

• It decreases proportionally to r squared.

For an infinitely long, straight current-carrying wire, what is true about the magnetic field at a uniform distance 'r' from the wire?

• The magnetic field is uniform in magnitude and direction above and below the wire.

• The magnetic field is uniform in magnitude but its direction is opposite above and below the wire.

• The magnetic field is not uniform in magnitude but its direction is the same above and below the wire.

• The magnetic field is neither uniform in magnitude nor direction.

According to the alternate Right-Hand Rule for a current-carrying wire, how do you determine the direction of the magnetic field?

• Thumb points in the direction of the magnetic field, and fingers curl in the direction of the current.

• Fingers point in the direction of the current, and the thumb curls in the direction of the magnetic field.

• Thumb points in the direction of the current, and fingers curl in the direction of the magnetic field.

• Fingers point in the direction of the magnetic field, and the thumb points in the direction of the current.