Which type of magnet is used in a crane to lift cars?

Who first observed the magnetic effect of an electric current?

Magnetic field lines of two magnets are shown in figures $A$ and $B$. Select the figure that represents the correct pattern of the field lines. Give reasons for your answer. Also,name the poles of the magnets facing each other.

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.

Why is the metallic body of electrical devices connected to the earth wire?

Explain what is short circuiting and overloading in an electric supply.