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Magnetic Effects of Electric Current Test - 16

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Magnetic Effects of Electric Current Test - 16
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  • Question 1
    1 / -0
    A positively charged particle (proton) is projected towards east.The magnetic field is towards south.The particle will be deflected towards
  • Question 2
    1 / -0
    A D.C. generator is based on the principle of.
    Solution
    The answer is D.

    Electromagnetic induction is a process where a conductor placed in a changing magnetic field (or a conductor moving through a stationary magnetic field) causes the production of a voltage across the conductor. This process of electromagnetic induction, in turn, causes an electrical current - it is said to be the induced current.
    Hence, the D.C. generator is based on the principle of electromagnetic induction.
  • Question 3
    1 / -0
    The electrode potential of the neutral wire in a mains supply cable is
    Solution
    Answer is B.

    The neutral wire is earthed, usually at the local substation, thus the neutral wire is at earth potential which is nothing but zero potential.
  • Question 4
    1 / -0
    In our houses all electrical devices operate on 220 V. It implies that
    Solution
    Voltage across the appliance connected in parallel is the same. As the voltage across all the appliances is same and equals to $$220$$ V, this means that all the appliance must be connected in parallel.
  • Question 5
    1 / -0
    Which of the following is not a type of wire in power supply.
    Solution
    In power supply system, there are three wires. One of the wires in this supply, usually with red insulation cover, is called live wire (or positive). Another wire, with black insulation, is called neutral wire (or negative). The earth wire, which has insulation of green colour, is usually connected to a metal plate deep in the earth near the house.

    Hence there is no such wire named Zero wire. 

    Answer is Option C.
  • Question 6
    1 / -0
    A vertical wire carrying current in the downward direction is placed in a horizontal magnetic field directed northwards. The direction of the force on the wire is ________.
    Solution
    According to Fleming's Left-hand rule, stretch your left hand in such a way that; the middle finger in the direction of current flow (Vertically downward), index finger in the direction of magnetic field ( Northwards). The direction of thumb will show the direction of force acting on the conductor that would be in Eastward direction.

  • Question 7
    1 / -0
    The colour of the earth wire is generally :
    Solution
    The colour of an earth wire is generally green.
  • Question 8
    1 / -0
    How can you determine direction of magnetic field lines around a current carrying conductor
    Solution
    Direction of magnetic field lines around a current carrying conductor can be found by Right Hand Thumb Rule.
    Imagine that you are holding a current-carrying straight conductor in your right hand such that the thumb points towards the direction of current. Then your fingers will wrap around the conductor in the direction of the field lines of the magnetic field.

  • Question 9
    1 / -0
    A solenoid with a soft iron core is called a _____.
    Solution
    The combination of a solenoid and a soft iron core operates on the basis of the magnetic effect of electric current i.e, it shows magnetic behavior on the flow of current, and thus its an electromagnet.
  • Question 10
    1 / -0
    Which of the following uses the principle of electromagnetic induction?
    Solution

    The change in magnetic field lines associated with a coil is the cause of induced electric current in it. This is the principle of Electromagnetic induction. This change can be achieved by:
    • by moving the coil in a magnetic field or
    • by changing the magnetic field around the coil.

    Electric generator uses this principle in which a coil rotates in a magnetic field such that the current is induced in it due to the change in magnetic field lines linked with it.
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