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Worksheetselectromagnetic induction class 10th
Total questions: 57
Worksheet time: 1hrs 17mins
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 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
moving the magnet to the left
A transformer has 2400 turns on its primary coil and 200 turns on its secondary coil.
What input voltage is needed to give an output voltage of 240 V?
12 V
20 V
240 V
2880 V
A current-carrying coil in a magnetic field experiences a turning effect.
How can the turning effect be increased?
Increase the number of turns on the coil.
Reduce the size of the current.
Reverse the direction of the magnetic field.
Use thinner wire for the coil.
A current-carrying wire XY lies in the magnetic field between the two poles of a U-shaped
electromagnet. A force acts on the wire XY because of the magnetic field.
How many of these actions cause the direction of the force on the wire XY to be reversed?
0
1
2
3
A step-up transformer is used before electricity is transmitted by overhead cables.
Which statement explains why the step-up transformer is used?
It increases the current to increase the speed at which the electricity travels.
It increases the current to reduce energy loss in the cables.
It increases the voltage to increase the speed at which the electricity travels.
It increases the voltage to reduce energy loss in the cables.
Which diagram represents the voltage output of a simple a.c. generator?
A
B
C
D
A transformer has 1000 turns on its primary coil. An input voltage of 12 V is applied to the primary
coil, and an output voltage of 120 V is induced across the secondary coil.
How many turns are on the secondary coil of the transformer?
100
120
1000
10 000
The diagram shows a flat, rectangular coil placed between the poles of a magnet.
There is a current in the coil that makes it turn in the direction shown in the diagram.
Which change would make the coil turn in the opposite direction?
decreasing the current in the coil
increasing the number of turns on the coil
reversing both the direction of the current in the coil and the poles of the magnet
reversing only the direction of the current in the coil
An e.m.f. is induced across a wire when it moves through the magnetic field between the poles of
a magnet.
Which electrical device operates because of this effect?
a battery
a cathode-ray tube
a generator
a motor
A wire is placed between the poles of a horseshoe magnet. There is a current in the wire in the
direction shown, and this causes a force to act on the wire.
Which arrangement or arrangements will cause a force in the same direction as the original
arrangement?
P, Q and R
P and Q only
P only
R only
A transformer has 50 turns on its primary coil and 100 turns on its secondary coil. An alternating
voltage of 25.0 V is connected across the primary coil.
What is the voltage across the secondary coil?
12.5 V
50.0 V
100 V
200 V
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
A coil carries a current in a magnetic field. The coil experiences a turning effect.
Which device uses this effect?
a d.c. motor
an electromagnet
a relay
a transformer
The diagram shows a transformer.
The input voltage is 240 V.
What is the output voltage?
6.0 V
12 V
20 V
40 V
A strong electromagnet is used to attract pins.
What happens when the current in the coil is halved?
No pins are attracted.
Some pins are attracted, but not as many.
The same number of pins is attracted.
More pins are attracted.
What type of current is being produced?
Alternating
Direct
What type of current is being produced?
Alternating
Direct
Which activity will produce the highest current?
Move the magnet bar into the coil while the coil remains stationery
Move the coil into the magnet bar while the magnet remains stationery
Move the coil and magnet towards each other
Move the coil and magnet away from each other
Discuss the applications of electromagnetic induction in everyday life.
Electromagnetic induction is used in wireless headphones to transmit audio signals.
Electromagnetic induction has various applications in everyday life such as generating electricity, wireless charging, transformers, induction cooktops, and metal detectors.
Electromagnetic induction is used in electric toothbrushes to generate vibrations.
Electromagnetic induction is used in MRI machines to create detailed images of the body.
What is the direction of induced current in a coil when the magnetic field through it changes?
The direction of the induced current is such that it opposes the change in magnetic field.
The direction of the induced current is opposite to the direction of the magnetic field.
The direction of the induced current is random and cannot be determined.
The direction of the induced current is such that it aligns with the change in magnetic field.
Explain the concept of induced emf.
The concept of induced emf is the generation of electromotive force in a conductor due to a static magnetic field.
The concept of induced emf is the generation of electromotive force in a conductor due to a changing magnetic field.
The concept of induced emf is the generation of electromotive force in a conductor due to an increase in resistance.
The concept of induced emf is the generation of electromotive force in a conductor due to a decrease in temperature.
How is electromagnetic induction used in generators?
By passing a current through a coil of wire
By using a permanent magnet to generate electricity
By rotating a coil of wire within a magnetic field
By heating a wire to create an electric current
What is the role of a magnetic field in electromagnetic induction?
The role of a magnetic field in electromagnetic induction is to generate heat in a conductor.
The role of a magnetic field in electromagnetic induction is to create a static charge in a conductor.
The role of a magnetic field in electromagnetic induction is to induce an electromotive force (EMF) in a conductor.
The role of a magnetic field in electromagnetic induction is to increase the resistance in a conductor.
Describe the process of electromagnetic induction in a coil.
Electromagnetic induction is the process of generating a magnetic field in a coil of wire by changing the electric current around the coil.
Electromagnetic induction is the process of generating an electromotive force (emf) or voltage in a coil of wire by changing the magnetic field around the coil.
Electromagnetic induction is the process of generating heat in a coil of wire by changing the resistance of the coil.
Electromagnetic induction is the process of generating light in a coil of wire by changing the temperature of the coil.
What is the difference between mutual induction and self-induction?
Mutual induction is the induction of current in a neighboring coil due to a changing current in another coil, while self-induction is the induction of an opposing current in the same coil due to a changing current.
Mutual induction is the induction of current in a neighboring coil due to a changing magnetic field in another coil, while self-induction is the induction of an opposing current in the same coil due to a changing magnetic field.
Mutual induction is the induction of voltage in a neighboring coil due to a changing current in another coil, while self-induction is the induction of an opposing voltage in the same coil due to a changing current.
Mutual induction is the induction of current in a neighboring coil due to a changing magnetic field in another coil, while self-induction is the induction of an opposing magnetic field in the same coil due to a changing current.
Explain Lenz's law.
The direction of an induced current in a conductor opposes the change that produced it.
The direction of an induced current in a conductor is the same as the change that produced it.
Lenz's law states that there is no induced current in a conductor.
Lenz's law only applies to magnetic fields.
State Faraday's law of electromagnetic induction.
The electromotive force (EMF) induced in a circuit is directly proportional to the rate of change of magnetic flux through the circuit.
The electromotive force (EMF) induced in a circuit is inversely proportional to the rate of change of magnetic flux through the circuit.
The electromotive force (EMF) induced in a circuit is directly proportional to the resistance of the circuit.
The electromotive force (EMF) induced in a circuit is directly proportional to the magnetic flux through the circuit.
What is electromagnetic induction?
Process of generating magnetic field by changing electric current
Process of generating sound by changing electric current
Process of generating electric current by changing magnetic field
Process of generating heat by changing magnetic field
Can you produce current in a wire with a magnet that is sitting still?
Yes; having a magnet near a wire is enough to excite the electrons
No; the magnetic field has to be changing to excite the electrons
No; magnets cannot create electricity
___________________rule can be used to determine the direction of the ___________ induced current produced.
Fleming's Left Hand Rule
Fleming's Right Hand Rule
Right Hand Grip Rule
In electromagnetic induction, what is being created?
Magnetism
Electrical energy
Mechanical energy
Chemical energy
What type of process is shown?
Electromagnet
Electric motor
Electric generator
Electromagnetic induction
Which action will increase the deflection of the galvanometer pointer?
The magnetic pole is reversed
The number of turns of coils is increased
The coil is made from insulated wire
The magnet is slowly pushed into the coil
The direction of induced current is given by
Fleming’s right hand rule
Fleming’s left hand rule
Right hand thumb rule.
Left hand thumb rule.
A magnet is moved towards a coil (i) quickly (ii) slowly. The induced potential difference
more in (i) than in (ii) case
more in (ii) than in (i) case
same in both
can’t say
The condition for the phenomena of electromagnetic induction is that there must be a relative motion between
the galvanometer and magnet
the coil of wire and galvanometer
the coil of wire and magnet
the magnet and galvanometer
A coil of insulated copper wire is connected to a galvanometer forming a loop and a magnet is:
A: Held stationary
B: Moved away along its axis
C: Moved towards along its axis
There will be a induced current in:
A only
A and B only
B and C only
A, B and C
An induced emf is produced when a magnet is moved into a coil. The magnitude of induced emf does not depend on:
The speed with which the magnet is moved
The number of turns of the coil
The resistivity of the wire of the coil
The strength of the magnet
Two coils C1 and C2 are wrapped around a non conducting cylinder. Coil C1 is connected to a battery and key and C2 with galvanometer G. On pressing the key , current starts flowing in the coil C1. You will observe (a) in the galvanometer when the current is passed continuously through coil C1.
Two coils C1 and C2 are wrapped around a non conducting cylinder. Coil C1 is connected to a battery and key and C2 with galvanometer G. On pressing the key , current starts flowing in the coil C1. You will observe (a) in the galvanometer when current in the coil C1 is switched off
Two coils C1 and C2 are wrapped around a non conducting cylinder. Coil C1 is connected to a battery and key and C2 with galvanometer G. On pressing the key , current starts flowing in the coil C1. You will observe (a) in the galvanometer when key K is pressed on.
What is electromagnetic induction?
The magnitude of induced current is directly proportional to the rate of _____________ linked with the coil
magnetic field
number of magnetic field lines
change of magnetic field
change of number of magnetic field lines
