What does the divergence of magnetic field lines near the ends of a current-carrying straight solenoid indicate?

Make a table with names of three electrical appliances used in your home in one column, their power, voltage rating, and approximate time for which each is used in one day in the other columns.

$(a)$ What is an electromagnet? What does it consist of?
$(b)$ Name one material in each case which is used to make a: $(i)$ permanent magnet $(ii)$ temporary magnet.
$(c)$ Describe an activity to show how you can make an electromagnet in your school laboratory.

For a current in a long straight solenoid,$N-$ and $S-$ poles are created at the two ends. Among the following statements,the incorrect statement is:

Which instrument converts mechanical energy to electrical energy?

How is the strength of the magnetic field at a point near a wire related to the strength of the electric current flowing in the wire?