Electromagnetic Induction

QuizÂ by MILI SANTHOSH

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15 questions
• Q1
As a magnet is moved into the coil of wire as shown, there is a small reading on the sensitive ammeter. Which change increases the size of the reading?
unwinding some of the turns of wire
moving the opposite pole into the coil
pulling the magnet out of the coil
pushing the magnet in faster
60s
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• Q2
A student moves a magnet into a coil of wire as shown in the diagram. The coil of wire is connected to a sensitive ammeter. Which change does not produce an increase in the reading?
increasing the resistance of the ammeter
increasing the strength of the magnet
increasing the number of turns on the coil
increasing the speed of the magnet
60s
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• Q3
A current is produced when a wire is moved between two magnets as shown. Which device uses this effect?
a battery
an electromagnet
a generator
a motor
60s
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• Q4
A bar magnet is pushed into one end of a long coil connected to a sensitive meter. Which of the following affects the magnitude of the deflection of the meter?
the speed with which the magnet enters the coil
the direction in which the coil is wound
which pole of the magnet enters first
which end of the coil is used
60s
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• Q5
The diagram shows the N-pole of a magnet moving into, and out of, a coil of wire. This movement produces a current in the coil of wire. The current produces a magnetic pole at X. Which pole is produced at X when the magnet is moved in and when it is moved out?
N pole when the magnet is moved in, S pole when the magnet is moved out.
N pole when the magnet is moved in, N pole when the magnet is moved out.
S pole when the magnet is moved in, N pole when the magnet is moved out.
S pole when the magnet is moved in, S pole when the magnet is moved out.
60s
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• Q6
A magnet is moved towards a coil of insulated wire. A voltmeter connected across the coil shows a positive reading. What produces a higher reading on the voltmeter?
moving the magnet away from the coil at a slower speed
moving the magnet towards the coil at a faster speed
moving the magnet towards the coil at a slower speed
moving the magnet away from the coil at the same speed
60s
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• Q7
The electromotive force (e.m.f.) induced in a conductor moving at right-angles to a magnetic field does not depend upon
the resistance of the conductor.
the strength of the magnetic field.
the length of the conductor.
the speed of the conductor.
60s
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• Q8
A small coil is connected to a galvanometer G, as shown. When a magnet is allowed to fall towards the coil, the galvanometer pointer gives a momentary deflection to the right of the zero position. The magnet moves through the coil. What happens to the galvanometer pointer as the magnet falls away from the coil?
It gives a momentary deflection to the left.
It gives a momentary deflection to the right.
It gives a continuous reading to the right.
It gives a continuous reading to the left.
60s
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• Q9
A magnet is pushed slowly into a coil and there is a current in the coil in the direction shown. The magnet is then pulled out quickly from the same end of the coil. What happens to the direction and the size of the current?
direction unchanged; size increased
direction reversed; size decreased
direction reversed; size increased
direction unchanged; size decreased
60s
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• Q10
A magnet is pushed horizontally towards a coil of wire, inducing an e.m.f. in the coil. In which direction does the induced e.m.f. make the coil move?
towards the magnet
upwards
away from the magnet
downwards
60s
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• Q11
A conductor is moving horizontally across a vertical magnetic field. An e.m.f. is induced in the conductor. No deflection is seen on the ammeter. What is the reason for this?
The ammeter is not between the poles.
The conductor is not cutting field lines.
The poles are too close together.
The conductor is moving too slowly.
60s
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• Q12
The diagram shows how a magnet and a coil may be used to induce an electric current. How could the ammeter reading be increased?
Turn the magnet round, then move the coil.
Use a coil with more turns.
Put a resistor in series with the ammeter.
Move the coil more slowly.
60s
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• Q13
A small coil is connected to a sensitive ammeter. The ammeter needle can move to either side of the zero position. As the magnet falls towards the coil, the ammeter needle moves quickly to the right of the zero position. The magnet moves through the coil. How does the ammeter needle move as the magnet falls away from the coil?
It moves quickly to the right of the zero position and then returns to zero.
It does not move
It moves quickly to the left of the zero position and then returns to zero.
60s
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• Q14
A permanent magnet moving up and down on the end of a spring induces an e.m.f. in a coil. Which factor, on its own, would decrease the maximum value of the induced e.m.f.?
increasing the number of turns in the coil
raising the support of the spring
raising the coil
increasing the strength of the magnet
60s
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• Q15
A student pushes the N-pole of a bar magnet into the end Q of a long solenoid and observes a deflection to the right on the sensitive ammeter. What will produce a deflection in the same direction?
pulling the N-pole out of end Q
pushing the N-pole into end P
pushing the S-pole into end P
pulling the S-pole out of end P
60s
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