Electromagnetic Fields & Induction

___ Law says that the Induced current is proportional to the change of magnetic flux 

• Lenz'
• Faraday's
• Ampere's

___ Law says that a current produced by an induced emf moves in a direction so that its magnetic field opposes the original change in flux

• Lenz'
• Faraday's
• Ampere's

As the north pole of the magnet is moved into the coil, the magnetic flux is _________.

• increasing

• decreasing

• remains constant

• depends on the speed of the magnet

The turn is contained in a magnetic field such that the lines of induction of the magnetic field are parallel to the plane of the turn. Which statement is correct?

• An induction current flows clockwise;

• The induction current in the coil flows counter-clockwise;

• The induction current in the coil will occur when the magnetic field induction changes;

• There is no induction current in the coil.

A ring is originally oriented 30-deg from the magnetic field. Which of the following would increase the flux?

• increasing the field

• reversing the direction of the field

• increasing 30-deg to 90-deg

• decreasing 30-deg to 0-deg

The magnetic field enclosed by a 0.5 m² wire loop increases from 0T to 3T in five seconds. Which of the following could be used to calculate the voltage in the coil?

• 
• 
• 
• 

The magnetic field increases from 0T to 5T in the direction shown. What direction is current induced in the wire?

• Clockwise

• Counterclockwise

• No current

The device pictured is a ______ and its purpose is to ________.

• transformer, covert high voltage to low voltage

• motor, convert electricity to kinetic energy

• generator, convert kinetic energy to electricity

• electromagnet, convert current into magnetic field

A particle carrying a charge of +e travels in a circular path in a uniform magnetic field. If instead the particle carried a charge of +2e, the radius of the circular path would have been ____.

• twice the original radius

• four times the original radius

• the same as the original radius

• one-half the original radius

• one-fourth the original radius

A stationary proton is in a uniform magnetic field of 0.20 T. What is the magnitude of the magnetic force on the proton?

• zero

• 1.6 × 10^-21 𝑁

• 3.2 × 10^-21 𝑁

• 1.6 × 10^-20 𝑁

• 3.2 × 10^-20 𝑁