Electromagnetic Induction (IGCSE)

Multiple Choice

Which of the following factors can affect the magnitude of an induced e.m.f. in a conductor?

• The speed at which the conductor moves across the magnetic field

• The color of the conductor

• The temperature of the room

• The shape of the conductor

Open Ended

Why is electromagnetic induction significant in modern technology and daily life?

Multiple Choice

What does e.m.f. stand for in the context of electricity?

• Electromagnetic field

• Electromotive force

• Electric motion factor

• Energy magnetic flux

Fill in the Blank

The production of an e.m.f. by moving a wire in a magnetic field is known as ___.

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Open Ended

Describe how the speed of inserting a magnet into a coil affects the size of the deflection observed in the galvanometer. Refer to the experiment setup shown.

Multiple Select

Which of the following actions will result in a change in the galvanometer reading during an electromagnetic induction experiment?

• Magnet held still

• Magnet quickly inserted

• Magnet removed

• Increasing coil turns

Multiple Choice

When moving a wire downwards through a magnetic field, what device is used to detect the induced e.m.f.?

• Voltmeter

• Galvanometer

• Ammeter

• Oscilloscope

Open Ended

Explain how the direction of induced e.m.f. changes when the wire is moved upwards versus downwards through the magnetic field.

Multiple Select

Which of the following actions will induce an e.m.f. in a wire placed between two magnets?

• Moving the wire downwards through the magnetic field

• Keeping the wire stationary

• Moving the wire parallel to the magnetic field lines

• Moving the wire upwards through the magnetic field

Fill in the Blank

According to Faraday's law, the e.m.f. induced in a conductor is proportional to the ___ at which the magnetic field lines are cut.

Multiple Select

Which of the following methods will increase the induced e.m.f. in a wire? Select all that apply.

• Moving the wire faster

• Using a stronger magnet

• Decreasing the length of wire in the magnetic field

• Increasing the length of wire in the magnetic field

Open Ended

Describe two different ways to induce an e.m.f. in a conductor based on the diagrams shown.

Multiple Choice

If a bar magnet is pushed into a coil of wire, the needle of the galvanometer swings.
What happens to the direction of the induced e.m.f. when the magnet is withdrawn from the coil?

• It remains the same

• It reverses direction

• It disappears

• It increases

Multiple Choice

A magnet is suspended from a spring so that it can move freely inside a stationary coil. The coil is

connected to a sensitive centre-zero galvanometer.

The magnet repeatedly moves slowly up and down.

What does the galvanometer show?

• a constantly changing reading

• a steady reading to the left

• a steady reading to the right

• a steady reading of zero

Multiple Choice

A student investigates electromagnetic induction. She has a bar magnet and a coil of wire that is

connected to a sensitive ammeter.

Which movement does not cause a reading on the ammeter?

• moving the magnet to the left

• moving the coil to the right

• moving both the magnet and the coil to the left at the same speed

• moving both the magnet and the coil towards each other at the same speed

Multiple Choice

The diagram shows a coil of wire connected to a voltmeter.

A student has a magnet and an unmagnetised iron rod.

How can an e.m.f. be induced across the coil?

• holding the magnet inside the coil

• holding the iron rod inside the coil

• pushing the magnet into the coil

• pushing the iron rod into the coil

Multiple Choice

What type of current is being produced?

• Alternating

• Direct

Multiple Choice

The production of electric current by a changing magnetic field is called ____________________________________.

• induced current

• electromotive force

• electromagnetic induction

• internal resistance

Multiple Choice

Which of the following actions will increase the magnitude of the induced e.m.f. in a coil of wire?

• Moving the magnet faster

• Using a weaker magnet

• Decreasing the number of turns on the coil

• Moving the wire slower

Multiple Select

Which of the following statements are true about direct current (D.C.)?

• It flows in only one direction.

• It is supplied by batteries.

• It is supplied by wall sockets.

• It produces a straight line on a CRO.

Multiple Choice

Which device supplies D.C. electricity?

• Battery

• Wall socket

• Transformer

• Light bulb

Fill in the Blank

A.C. mains in the UK is about ___ volts.

Multiple Choice

Distinguish between direct current (d.c.) and alternating current (a.c.).

• D.C. flows in one direction only, A.C. changes direction constantly.

• D.C. is used in mains electricity, A.C. is used in batteries.

• A.C. is always safer than D.C.

• D.C. has a frequency of 50Hz, A.C. does not.

Fill in the Blank

AC generators are also called ___.

Fill in the Blank

A generator converts ___ energy into electrical energy.

Multiple Select

Which of the following are needed to build a generator?

• A magnetic field

• A moving wire

• A battery

• A resistor

Multiple Choice

Which of the following factors does NOT affect the magnitude of an induced e.m.f. in a conductor?

• The speed at which the conductor moves through the magnetic field

• The strength of the magnetic field

• The material of the conductor

• The direction of the magnetic field

Multiple Choice

Which diagram represents the voltage output of a simple a.c. generator?

• B
• C
• D
• A

Open Ended

Reflecting on today's lesson about electromagnetic induction, what is one concept you found most interesting or would like to explore further?