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

What is the difference between a direct current and an alternating current? How many times does $AC$ used in India change direction in one second?

Which of the following statements is incorrect for a current-carrying solenoid?

The magnetic field produced by a current flowing through a straight conductor is inversely proportional to the $........$.

$(a)$ Name the type of electric current generated by most of the power stations in our country.
$(b)$ Why is it preferred over the other type?
$(c)$ State the frequency of the power supply generated in India.

$(i)$ Write the values of the following physical quantities in connection with domestic power supply in our country: $(a)$ potential difference between live wire and neutral wire.
$(b)$ frequency of $AC$.
$(ii)$ Explain the role of the following as safety measure in domestic electric appliances/circuits:
$(a)$ earth wire
$(b)$ fuse.