Magnetic Forces on Moving Charges

The video tutorial covers the basics of magnetic fields and forces, focusing on how charged particles interact with magnetic fields. It introduces the right hand rule for determining the direction of magnetic forces and applies these concepts to solve various physics problems. The session also explores the mass spectrometer, explaining its function and real-world applications. The tutorial aims to prepare students for AP Physics exams by reviewing key concepts and problem-solving techniques.

What unit is used to measure the strength of a magnetic field?

• Joule

• Tesla

• Coulomb

• Newton

What does the magnetic field unit 'Tesla' signify?

• The charge of the particle

• The speed of the particle

• The weight of the magnetic field

• The strength of the magnetic field

Tags

NGSS.HS-PS2-5

Which rule is used to determine the direction of force on a charged particle in a magnetic field?

• Left-hand rule

• Right-hand rule

• Thumb rule

• Fleming's rule

What is the relationship between the magnetic force and the velocity of a charged particle when they are perpendicular?

• The particle changes direction only.

• The particle accelerates.

• The force is zero.

• The force is maximum.

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

What happens to a charged particle moving parallel to the magnetic field?

• It experiences maximum force.

• It moves in a spiral path.

• It does not experience any force.

• It reverses its direction.

Tags

NGSS.HS-PS3-5

What happens to the radius of a particle's path in a magnetic field if the magnetic field strength increases?

• The radius increases.

• The radius decreases.

• The radius becomes zero.

• The radius remains constant.

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NGSS.HS-PS3-5

In a mass spectrometer, what is the purpose of the velocity selector?

• To ionize the sample particles.

• To filter particles based on their velocities.

• To deflect particles to the detector.

• To accelerate particles to a uniform speed.

What is the relationship between the electric and magnetic forces in a velocity selector when a particle moves undeflected?

• Electric and magnetic forces are equal.

• There are no electric or magnetic forces acting.

• Magnetic force is greater than electric force.

• Electric force is greater than magnetic force.

Tags

NGSS.HS-PS3-5

What determines the direction of the electric field necessary for a particle to move in a straight line through a region in a mass spectrometer?

• The charge of the particle.

• The direction of the magnetic field.

• The direction of the particle's velocity.

• The magnitude of the magnetic field.

Tags

NGSS.HS-PS3-5

How is the mass of a particle determined in a mass spectrometer?

• By the time it takes to travel through the spectrometer.

• By calculating the radius of the particle's path.

• By measuring the electric field strength.

• By the velocity of the particle.