What is the shape of the magnetic field lines inside a solenoid?

Normally,a red colour cable is used for the live wire in domestic electrical circuits.

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.

Find the minimum rating of fuse that can be safely used on a line on which two $1.1 \, kW$ electric geysers are to run simultaneously. The supply voltage is $220 \, V$. (in $A$)

How can it be shown that a magnetic field exists around a wire through which a direct current is passing?

The branch of science that covers the comprehensive study of electricity and magnetism is known as $.........$.