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Electromagnetic Induction

Quiz by MILI SANTHOSH

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15 questions
Show answers
  • 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?
    Question Image
    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?
    Question Image
    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?
    Question Image
    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?
    Question Image
    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?
    Question Image
    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?
    Question Image
    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?
    Question Image
    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?
    Question Image
    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?
    Question Image
    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?
    Question Image
    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?
    Question Image
    It moves quickly to the right of the zero position and then returns to zero.
    It gives a steady reading to the right.
    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.?
    Question Image
    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?
    Question Image
    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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    Delete

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