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Generators: The back emf in an electric motor is its maximum value under which condition?

• Current is a maximum
• Voltage is a maximum
• Motor speed is zero
• Motor speed is a maximum

Faraday's Law of Induction: This set of Physics Multiple Choice Questions & Answers (MCQs) focuses on "Faraday's Law of Induction."

• An emf is induced in a conductor when it is just entering a magnetic field.
• An emf is induced in a conductor when it moves parallel to the magnetic field.
• An emf is induced in a conductor when it moves perpendicular to the magnetic field.
• An emf is induced in a conductor when it cuts the magnetic flux.

Electromagnetic Induction: Which of the following quantity can be induced?

• None of the above
• EMF
• Resistance
• Conductance
• Capacitance

A 0.200 m wire is moved parallel to a 0.500_T magnetic field at a speed of 1.50 m/s. What emf is induced across the ends of the wire?

• 1.00 V
• 2.25 V
• zero
• 0.600 V

Generators: The basic function of the electric generator is which of the following conversion processes?

• Electrical energy to mechanical
• Low voltage to high or vice versa
• Mechanical energy to electrical
• Alternating current to direct

Generators: A motor has an internal resistance of 12 ohms. When running, the motor has a back emf of 30 V and draws a current of 4.0 A. What is the supply voltage in this case?

• 78 V
• 120 V
• 48 V
• 30 V

Which law is used in finding the direction of current in an a.c. Generator?

• Lenz's law
• Maxwell's law
• Corkscrew law
• Ampere circuital law

The direction of Induced Current Flow: Which of the following is correct?

• An induced current will flow in the direction that mimics its cause.
• None of these
• An induced current will flow in the direction that will creat e a magnetic field opposing a change in flux.
• The right-hand rule reveals the direction of an induced current.
• Induced currents can never create their own magnetic fields.

Faraday's Law of Induction: A sensitive ammeter is connected to a wire loop and placed within the magnetic field of a strong horseshoe magnet. The ammeter shows a deflection when:

• the wire's axis is parallel to the field
• neither wire nor magnet is moving
• the wire is moved parallel to the field
• the wire is moved perpendicular to the field

Faraday's laws are the result of the conservation of which quantity?

• Magnetic field
• Momentum
• Charge
• Energy

An airplane with a wingspan of 60.0 m flies parallel to the Earth's surface at a point where the downward component of the Earth's magnetic field is 0.400 x 10-4 T. If the induced potential between the wingtips is 0.900 V. What is the plane's speed?

• 338 m/s
• 417 m/s
• 250 m/s
• 375 m/s

Generators: The black emf of a motor refers to a source of voltage that:

• Occurs when the motor runs backwards
• Is biggest when the current through the motor is the biggest.
• Is biggest when the motor turns the fastest
• Occurs when the motor is used as a generator

Generator: The electric motor's function is one of the following conversion processes?

• Alternating current to direct
• Mechanical energy to electrical energy
• Electrical energy to mechanical
• Low voltage to high or vice versa

Len's Law: The principle or law that says "an induced emf in a circuit loop produces a current whose magnetic field opposes the further change of magnetic flux is a credit to:

• Lenz
• Faraday
• Ampere
• Volta

Electromagnetic Induction: A circuit consists of a loop of wire in series with a resistor. A galvanometer is attached to the resistor. A bar magnet is thrust in and out of the loop one time. Which of the following statement is true?

• The galvanometer needle moves from zero to a maximum value and stays there.
• The galvanometer needle moves from zero to a maximum value on one side, then back through zero to a maximum on the other side, then back to zero.
• The galvanometer needle moves from zero to a maximum value and returns to zero.
• None of these
• The galvanometer needle remains at zero.