Motional emf via Newton's Second Law

The video tutorial explains the concept of motional EMF, where a conductor moving in a magnetic field induces a voltage across it. Using the right hand rule, the tutorial demonstrates how charges move within the conductor, leading to a net charge distribution. It discusses the equilibrium between magnetic and electrostatic forces and derives the equation for voltage across a uniform electric field. The tutorial concludes with a summary of key points.

What is the basic concept of motional EMF?

• A conductor moving in a magnetic field generates a voltage.

• A conductor moving in a magnetic field generates a current.

• A stationary conductor in a magnetic field generates a voltage.

• A stationary conductor in a magnetic field generates a current.

According to the right-hand rule, what direction does the thumb point?

• In the direction of the force on positive charges

• In the direction of the velocity

• In the direction of the force on negative charges

• In the direction of the magnetic field

What happens to the charges in a conductor when it reaches equilibrium?

• They move vertically.

• They stop moving.

• They move horizontally at a constant velocity.

• They accelerate.

What is the relationship between magnetic force and electric force at equilibrium?

• Magnetic force is greater than electric force.

• Magnetic force equals electric force.

• Electric force is greater than magnetic force.

• There is no relationship.

What is the equation for the voltage across a uniform electric field?

• Voltage equals electric field times distance.

• Voltage equals electric field divided by distance.

• Voltage equals electric field plus distance.

• Voltage equals electric field minus distance.

What does the motional EMF equation assume about the angle between velocity and magnetic field?

• The angle is 90°.

• The angle is 0°.

• The angle is 180°.

• The angle is 45°.

What is the formula for motional EMF in a conductor?

• EMF equals velocity plus magnetic field times length.

• EMF equals velocity divided by magnetic field times length.

• EMF equals velocity times magnetic field times length.

• EMF equals velocity minus magnetic field times length.