Draw the magnetic field lines around the current-carrying straight wire and solenoid.

Define magnetic flux.

What is electromagnetic induction?

In what two ways electric generator differs from electric motor?

What will you do to increase the magnetic flux for the coil without changing the magnetic field of the bar magnet?

A model of DC motor as shown in the diagram was made by Rakesh. He removed the enamels of the ends of the coil and used new cell. When he brought a magnet close to the coil it did not move although there was no problem in circuit? What might be the possible causes of it? Mention any two of them.