16. What does an electric current carrying wire behaves like? (1)
17. How to define field lines? (1)
18. What do you meant by solenoid? (1)
19. What do you understand by electromagnet? (1)
20. Draw the magnetic field lines due to current through circular loop. (1)
21. State the properties of magnetic field lines? (1)
22. State the similarity between solenoid and bar magnet. Also a difference between solenoid and coil? 23. Explain Fleming’s left hand rule. (2)
24. What is electric fuse? What material is used for fuse wire?
25. There are some differences between electric motor and generator. State them. (2)
26. Give any two features of magnetic field due to current carrying solenoid coil. (2)
27. Describe an activity to show that a magnetic field is produced by an electric current flowing a circular coil of wire. (4)16. What does an electric current carrying wire behaves like? (1)
17. How to define field lines? (1)
18. What do you meant by solenoid? (1)
19. What do you understand by electromagnet? (1)
20. Draw the magnetic field lines due to current through circular loop. (1)
21. State the properties of magnetic field lines? (1)
22. State the similarity between solenoid and bar magnet. Also a difference between solenoid and coil? 23. Explain Fleming’s left hand rule. (2)
24. What is electric fuse? What material is used for fuse wire?
25. There are some differences between electric motor and generator. State them. (2)
26. Give any two features of magnetic field due to current carrying solenoid coil. (2)
27. Describe an activity to show that a magnetic field is produced by an electric current flowing a circular coil of wire. (4
Answers
Answer:
16) When an electric current flows through a wire, it behaves like a magnet. A current carrying coil of an insulated wire wrapped around a piece of iron is called an electromagnet. The electromagnets are also used to separate magnetic material from the junk.
17) A field line is a graphical visual aid for visualizing vector fields. It consists of a directed line which is tangent to the field vector at each point along its length.
18) A coil of many circular turns of insulated copper wire wrapped closely in the shape of a cylinder is called a solenoid.
19) An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. current through the wire creates a magnetic field which is concentrated in the hole, denoting the centre of the coil.
21) Some important properties of magnetic field lines are listed below:-
. Magnetic field lines goes from north pole to south pole, when outside the magnet.
. Magnetic field lines goes from south pole to north pole, when inside the magnet.
. Magnetic field lines appear as concentric lines and no two lines intersect each other.
. Magnetic field lines are closer to each other when they are near the magnet but become further from each other when they are far from the magnet.
. Closeness of field lines shows the strength of magnetic field.