Exploring Magnetic Forces and Fields (18 Quiz II)

What is the unit of magnetic field strength in the International System of Units (SI)?

• Tesla

• Gauss

• Newton

• Ampere

Which of the following best describes the direction of magnetic field lines around a bar magnet?

• From north to south inside the magnet

• From south to north inside the magnet

• From north to south outside the magnet

• From south to north outside the magnet

Using the right-hand rule, determine the direction of the magnetic force on a positive charge moving to the right in a magnetic field directed into the page.

• Upward

• Downward

• To the left

• Out of the page

Explain how electromagnetic induction is used in the operation of a generator.

• It uses a battery to create a magnetic field.

• It converts mechanical energy into electrical energy by rotating a coil within a magnetic field.

• It uses a magnetic field to stop the flow of current.

• It stores electrical energy in a magnetic field.

What is the Lorentz force law equation for a charged particle moving in a magnetic field?

Describe the effect of increasing the speed of a charged particle on the magnetic force it experiences in a constant magnetic field.

• The magnetic force decreases.

• The magnetic force remains constant.

• The magnetic force increases.

• The magnetic force becomes zero.

Discuss the role of magnetic fields in the operation of an MRI machine.

• Magnetic fields are used to heat the body tissues.

• Magnetic fields align the protons in the body, which are then detected to create images.

• Magnetic fields are used to generate sound waves for imaging.

• Magnetic fields are used to measure electrical activity in the brain.

What is the primary factor that determines the strength of the magnetic field around a current-carrying wire?

• The length of the wire

• The material of the wire

• The amount of current flowing through the wire

• The temperature of the wire