# 12.1.1 Electromagnetic Induction

8 Questions | Total Attempts: 548  Settings  The production of an electromotive force across an electrical conductor in a changing magnetic field is known as Electromagnetic or magnetic induction. Are you getting ready for that physics test on electromagnetism? Give this quiz a try and polish up your knowledge on the topic as you prepare for the next class. All the best!

• 1.
The North pole of a magnet is pushed into a coil, and a current is induced.  Which of the following will NOT change the direction of induced current as measured by an ammeter.
• A.

Pulling the North end of the magnet out.

• B.

Pushing the south end of the magnet into the coil

• C.

Changing the polarity of the ammeter connected to the coil

• D.

Pushing the sound end of the magnet into the coil AND changing the polarity

• 2.
Which of following does not necessarily increase the size of the EMF induced when a magnetic north is placed into a coil
• A.

Moving the magnet faster

• B.

Increasing the number of coils of wire

• C.

Pulling the North out of the coil

• 3.
A magnet is placed into a coil.  The induced EMF across the coil is 10mV.  What would the EMF be if the coil was replaced by a coil with twice as many coils, and the passage of the magent into the coil took twice as long.
• A.

0mV

• B.

5mV

• C.

10mV

• D.

20mV

• E.

40mV

• 4.
An magentic field points vertically upwards, a current carrying wire carries current to the left.  In which way will the force be on the current carrying wire?
• A.

UP

• B.

DOWN

• C.

To LEFT

• D.

TOWARDS you

• E.

AWAY from you.

• F.

To RIGHT

• 5.
What is the basic argument which is needed to derive EMF= Blv
• A.

The electric force on the electron is greater than the magnetic force on the electron

• B.

The electric force on the electron is equal to the magnetic force on the electron

• C.

The electric force on the electron is less than the magnetic force on the electron

• D.

F=ma

• E.

The impulse of the electron is equal to its momentum change

• 6.
What is the magnetic flux linked by a coil when the normal to the coil and the direction of the magnetic field lines are parallel?
• A.

Magnetic flux x area (and measured in Webers)

• B.

Magnetic flux x area (and measured in Teslas)

• C.

Magnetic flux density x area (and measured in Teslas)

• D.

Magnetic flux density x area (and measured in Webers)

• E.

Zero.

• 7.
When there is an EMF, the direction of the current will always be such that (the magnetic field caused by it) will try to oppose the change producing it.  Whose law is this?
• A.

• B.

Lenz's Law

• C.

Maxwell's Law

• D.

Boltzmann's Law

• E.

Law of Conservation of Energy

• F.

1st Law of Thermodynamics

• G.

1st Law of Electrodynamics

• 8.
Are there any parts of 12.1 Electromagnetic Induction that you are not sure about?  Can you formulate a question that we can address in class?
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