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Magnetic Effects of Electric Current Test - 18

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Magnetic Effects of Electric Current Test - 18
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  • Question 1
    1 / -0
    Mark the incorrect statement.
    Solution
    A magnet can generate electric current by the means of electromagnetic induction. When there is a relative motion between a coil and a magnet, the magnetic flux linked to the coil changes due to that relative motion. This change in magnetic flux will induce a current in the coil, which is known as $$induced\ current$$.
  • Question 2
    1 / -0
    A coil of insulated copper wire is connected to a galvanometer. What would happen if a bar magnet is (i) Pushed into the coil?
    Solution
    Due to change in magnetic flux linked with coil, the galvanometer shows deflection (say towards right). The galvanometer will show a deflection towards left when the bar magnet is withdrawn from inside the coil.
  • Question 3
    1 / -0
    In the statement of Fleming's left hand rule, force acting on the conductor is represented by
    Solution
    The direction of the current and that of the magnetic field perpendicular to each other and found that the force is perpendicular to both of them. The three directions can be illustrated through a simple rule, called Flemings left-hand rule. According to this rule, stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular. If the first finger points in the direction of magnetic field and the second finger in the direction of the current, then the thumb will point in the direction of motion or the force acting on the conductor. 

  • Question 4
    1 / -0
    Write the SI unit of electric power.
    Solution
    SI unit of electric power is Watt
    1 Watt = 1  Volt $$\times$$ 1 ampere.
  • Question 5
    1 / -0
    Neutral wire is usually insulated with:
    Solution
    In our houses, we receive AC electric power of $$220\ V$$ with a frequency of $$50\ Hz$$. One of the wires in this supply is with red insulation, called live wire. The other one is of black insulation, which is a neutral wire. The potential difference between the two is $$220\ V$$. The third is the earth wire that has green insulation and this is connected to a metallic body deep inside the earth. It is used as a safety measure to ensure that any leakage of current to a metallic body does not give any severe shock to a user.
  • Question 6
    1 / -0
    In the field of electromagnetism, the term 'EMI' stands for:
    Solution
    In the field of electromagnetism, the term EMI stands for Electro Magnetic Induction.
  • Question 7
    1 / -0
    In the statement of Fleming's left hand rule, magnetic field is represented by
    Solution
    According to Fleming's left-hand rule, one needs to stretch the thumb, forefinger, and middle finger of the left hand such that they are mutually perpendicular. If the first finger points in the direction of the magnetic field and the second finger in the direction of the current, then the thumb will point in the direction of motion or the force acting on the conductor.
  • Question 8
    1 / -0
    Mark the incorrect statement.
    Solution
    In our homes, we receive supply of electric power through a main supply (also called mains), either supported through overhead electric poles or by underground cables. 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). In our country, the 
    potential difference between the two is $$220   V$$. At the metre-board in the house, these wires pass into an electricity meter through a main fuse. Through the main switch they are connected to the line wires in the house. These wires supply electricity to separate circuits within the house. Often, two separate circuits are used, one of $$15   A$$ current rating for appliances with higher power ratings such as geysers, air coolers, etc. The other circuit is of 5 A current rating for bulbs, fans, etc. The earth wire, which has insulation of green colour, is usually connected to a metal plate deep in the earth near the house. This is used as a safety measure, especially for those appliances that have a metallic body, for example, electric press, toaster, table fan, refrigerator, etc. The metallic body is connected to the earth wire, which provides a low-resistance conducting path for the current. Thus, it ensures that any leakage of current to the metallic body of the appliance keeps its potential to that of the earth, and the user may not get a severe electric shock.
  • Question 9
    1 / -0
    Name the colour used in insulated wires of electrical appliance.
    Solution
    The three different colors of insulation used in the electrical wires are red, black, and green. In old convention, the red wire is the live wire, the black wire is neutral and the earth wire is given green insulation. In new convention, the brown wire is the live wire, the light blue wire is neutral and the earth wire is given green-yellow insulation.
  • Question 10
    1 / -0
    Which colour is used for earth wire?
    Solution
    The green one as well yellow color is used as Earth's wire. This is because the green and yellow type wires are for grounding purposes or we can say earthen purposes. Green colored wires are used in an electric circuit for grounding.
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