What is the role of the two conducting stationary brushes in a simple electric motor?

An electric generator is a device that converts electrical energy into mechanical energy.

You have just paid the electricity bill for your house.
$(i)$ What was it that your family consumed,for which you had to pay?
$(ii)$ In what unit was it measured?

What type of core is used to make an electromagnet?

Describe in short an activity to:
$(i)$ demonstrate the pattern of magnetic field lines around a straight current-carrying conductor, and
$(ii)$ find the direction of the magnetic field produced for a given direction of current in the conductor. Name and state the rule to find the direction of the magnetic field associated with a current-carrying conductor. Apply this rule to determine the direction of the magnetic field inside and outside a current-carrying circular loop lying horizontally on a table. Assume that the current through the loop is anticlockwise.

Define magnetic field. Describe an activity to draw magnetic field lines around a bar magnet from one pole to another pole.