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Magnetic Effects of Electric Current Test - 33

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Magnetic Effects of Electric Current Test - 33
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  • Question 1
    1 / -0
    A beam of protons is moving horizontally towards you. As it approaches you, it passes through a magnetic field which is directed upwards. As you see it, the magnetic field will deflect the beam to the:
    Solution
    Using Fleming's Left-hand rule as shown in the attached figure, the net force acting on the protons beam experiences a force to the left. Hence, the magnetic field deflects the beam to the left.

  • Question 2
    1 / -0
    Match the following:
    Section ASection B
    11. FuseP.P. Converts electric energy into mechanical energy
    22 Electric generatorQ.Q. Heating effect of electric current
    3.3. Electric motorR.R. Converts mechanical energy into electrical energy
    Solution
    • The fuse works on the principle of the heating effect of electric current.
    • An electric generator is a device which converts mechanical energy into electrical energy.
    • An electric motor is a device which converts electrical energy into mechanical energy.
    So, A is correct.
  • Question 3
    1 / -0
    Current is flowing through a conductor and creates a magnetic field. Assume that this is the only source of the magnetic field. Reversing a current in a straight conductor with no change to the magnitude(ampere value) will cause a _________. 
    Solution
    The direction of the magnetic field due to a current carrying wire can be determined using Right hand thumb rule. Using your right-hand, point your thumb in the direction of the current. Now, curl your fingers into a half-circle around the wire, they point in the direction of the magnetic field. So, Reversing a current in a straight conductor with no change to the magnitude(ampere value) will cause a reversal of the direction of the magnetic field.

  • Question 4
    1 / -0
    The diagram shows an extra lamp wired into an existing 220220 V A.C.V\ A.C. lighting system. To operate extra lamp independently a switch should be placed at.

    Solution
    As the wire passing through is connected to the live (red) wire of the 220V220V AC lighting system, the switch should be placed there in order to regulate the current to be flown through the extra lamp.
  • Question 5
    1 / -0
    In the given diagrams, compasses are used to plot the magnetic field around a bar magnetic field around a bar magnet with poles marked N (North) and S (South). Which of the following diagrams correctly shows the expected field pattern?
    Solution
    The magnetic field line is directed from the North pole to the South Pole outside the magnet. The arrowhead of the needle of the compass points toward the direction of the field. 
    So option (D) is correct.

  • Question 6
    1 / -0
    The magnetic lines of force inside a bar magnet.
    Solution

  • Question 7
    1 / -0
    Magnetic field outside a solenoid is:
    Solution
    A long straight coil of wire can be used to generate a nearly uniform magnetic field similar to that of a bar magnet. Such coils, called solenoids, have an enormous number of practical applications. The field can be greatly strengthened by the addition of an iron core. Such cores are typical in electromagnets.
    Magnetic field outside a solenoid is negligible.
  • Question 8
    1 / -0
    The magnetic field around a current-carrying coil lasts
    Solution

  • Question 9
    1 / -0
    Why is the switch for any electrical appliance always fitted on to the live wire ? 
    Solution
    Why is the switch for any electrical appliance always fitted on the live wire.
    The answer will be\rightarrow The device can never be switched off if switch is in the neutral load.
    Solution:- The live wire is always at higher potential where as neutral wire is always at zero potential.
    The switch must be placed in live wire to maintain the body of appliance at zero potential in the switch off position and if the switch is kept in neutral wire, then the body of the appliance to keep the body at  infinite potential in the switch on position.
  • Question 10
    1 / -0
    The magnetic field around a current carrying coil.
    Solution

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