Question

1 Can you think of an electromagnet that is capable of producing stronger magnetic field than the magnetic field produced by any permanent magnet?
2 what is known as the range of an ammeter
3 what will happen if the thick wire is kept horizontal instead of vertical ( in activity 13.5 ncert )
4 You are provided with an iron strip and a bar magnet. How will you distinguish them?
5 How does a compass needle work?
6 Can an ordinary magnet be used as a compass?
7 In this experiment, it is advised to use a small compass needle. ( in activity 13.5 ncert )
8 What will happen if a small compass needle is replaced with a big size compass needle? ( in activity 13.5 ncert )
9 How magnetic field lines of a straight current carrying wire are different from the field lines of a bar magnet?
10 What affect you will notice on the pattern of field lines if you interchange a rheostat by the plug key in this experimental arrangement? ( in activity 13.5 ncert )
11 How can the direction of the magnetic field be determined? Suggest all possible methods.
CLASS 10 CBSE ( answer in simple words)

Answer 1

1.Unlike a permanent magnet, the strength of an electromagnet caneasily be changed by changing the amount of electric current that flows through it. ... However, the magnetic field produced by the wire wrapped around the core can force some of the atoms within the core to point in onedirection.
2.A meter designed to measure electrical current is popularly called an “ammeter” because the unit of measurement is “amps.” In ammeterdesigns, external resistors added to extend the usable range of the movement are connected in parallel with the movement rather than in series as is the case for voltmeters.