simple quiz on induction

____________law states that the direction of the induced current is such that it always _______ ___ the change producing it.

• Lenz's Law, oppose

• Faraday's Law, oppose

• Lez's Law, follow

• Faraday's Law, follow

If the current passing through a wire held in a uniform magnetic field is doubled, the force acting on the wire will become:

• half

• Double

• four times

• six times

The practical application of the phenomena of mutual inductance is

• AC generators

• Transformer

• Rectifier

• Dynamo

Tesla is equal to:

• Newton meter / meter

• Newton ampere

• Newton coulomb

• Newton / (ampere meter)

If the speed of a conductor, moving in a uniform magnetic field perpendicularly is increased, the induced emf:

• Decrease

• Increase

• Remains constant

• become zero

A device that converts mechanical energy into electrical energy

• A. electric generator
• B. electric motor
• C. electromagnetic induction
• D. mechanical  generator

The process of creating a current in a circuit by changing a magnetic field

• A. electric generator
• B. electric motor
• C. electromagnetic induction
• D. magnet

Step-up transformer is a transformer that increases...

• voltage.

• current.

• resistance.

• conductance.

Assume primary has 240 turns and secondary has 60 turns. Primary is connected with 120V AC power supply. What is the voltage on the secondary?

• 30 V

• 0.333 V

• 2 V

• 120V

This picture is an example of a ___________

• Step- Up Transformer
• Step- Down Transformer
• Motor
• Generator