Unit 661 Inductors and EMF

The voltage that is produced in an inductor as a result of the changing magnetic field of another inductor is referred to as ____.

• Mutual inductance
• Self-inductance
• Proximity inductance
• Common inductance

In order to induce a voltage across a coil ____.

• The coil must be in motion
• Current must be increasing
• There must be relative motion between the coil and the magnetic field
• The coil must be cut by at least 10^8 lines of force per second

The strength of the magnetic field around a coil is determined by ____ and ____. 

• The rate of change of current, Its magnitude
• The direction of current, The number of turns
• The magnitude of current, The number of turns
• The magnitude of current, It direction

An inductor ____. 

• All of the above
• Provides a specific value of inductance
• Opposes any change in current
• Stores energy in a magnetic field

The voltage induced across an inductor as its magnetic field expands is called ____. 

• Counter emf
• Aiding voltage
• Forward voltage
• Transition voltage

The production of a voltage across an inductor as a result of its own  expanding or contracting magnetic field is called ____.

• Flux density
• Self-inductance
• Counter emf
• Faraday's second law

In 1831, Michael Faraday discovered that, by varying magnetic field with time, an electric field could be generated.

The phenomenon is known as

• electromagnetic induction

• voltage

• current

• amps

If two electric cables close to each other, if one of them is disconnect it may still be live because of .....

• magnetism

• mutual inductance

• heat

• cold

Rotation of a coil in a magnetic field produces ....

• a graph

• wind

• an electromotive force (emf)

• light

Inductance is that property of a circuit or component which causes an induced ..................? when the current through it changes

• light

• sound

• electromotive force (emf)