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C. Long-Answer Questions
1. Describe an experiment to show that an electric
current produces a magnetic field.
2. Describe an experiment to show that a magnetic
field exerts a force on a current-carrying wire.
3. How will you show that the direction of the force
exerted by a magneton a current-carrying
conductor depends on the directions of the magnetic
field and the current?
4. You are given a strong bar magnet and a compass.
Describe a method by which the magnetic field lines
due to the bar magnet can be drawn.
5. What is an electromagnet? How can you make an
electromagnet?
6. What is electromagnetic induction? Describe an
experiment to demonstrate it.
7. What is induced current? Describe two ways of
producing an induced current in a coil.
8. State Fleming's left-hand rule. Draw a neat diagram
showing the different parts of a DC motor. Explain
its working
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9. What is Fleming's right-hand rule? With a neat
diagram explain the working of an AC generator.
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10. What do you understand by live, neutral and earth
wires? Do all the three normally carry electricity?
11. What is the function of the earth wire in electric
lines? Why is the metallic body of an electric
appliance connected to the earth wire?
Answers
Answer:
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Explanation:
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Answer:
1.When current is passed through wire AB by closing the switch, we find that the compass needle is deflected from its north-south position. ... Thus, the deflection of compass needle by the current carrying wire shows that magnetic field is associated with an electric current.
2.Pass the current from the aluminium rod from its end B to A. You will observe that the rod is displaced towards the left, i.e., towards the inward of the magnet. ... The displacement of the rod in the above activity suggests that a force is exerted on the current carrying conductor, when it is placed in a magnetic field.
3.It states that ' If we hold the thumb, fore finger and middle finger of the left hand perpendicular to each other such that the fore finger points in the direction of magnetic field, the middle finger points in the direction of current, then the thumb shows the direction of force (motion) of the conductor.
4.(i) Place the bar magnet on a sheet of white paper fixed on a drawing board. Mark the boundary of the magnet. (ii) Place the magnetic compass near the north pole of the given magnet. ... (iv) In this way proceed step by step till you reach the south pole of the given magnet.
5. A simple electromagnet comprises a length of wire turned into a coil and connected to a battery or power supply. You can make an electromagnet stronger by doing these things: wrapping the coil around a piece of iron (such as an iron nail) adding more turns to the coil.
6.There is no induced e.m.f. and hence no current detected by the galvanometer. The experiment show that induced current (or induced emf) is produced in the coil due to the changing magnetic field in the solenoid. This process is called electromagnetic induction.
7. The different ways to induce current in a coil are as follows: (i) If a coil is moved rapidly between the two poles of a horse-shoe magnet, then an electric current is induced in the coil. (ii) If a magnet is moved relative to a coil, then an electric current is induced in the coil.
8.Fleming’s left-hand rule: Hold the forefinger, the centre finger and the thumb of your left hand to right angles to one other. Adjust your hand in such a way that the forefinger points in the direction of magnetic field and the and the centre finger points in the direction of the current, then the direction in which thumb points, gives
10. Live, neutral,and earth, are labels that are used to convey some information on the use of each wire. You are correct in thinking that in a typical two wire AC loop/circuit, both wires carry the same amount of current (amps). So, both wires could be considered live wires.
11. The metallic body is connected to the earth wire, that provides a low resistance conducting path for the current. Thus it assures that any leakage of current to the metallic body of the appliances keeps its potential to that of the earth and the user may not get a severe shock.
Explanation:
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