The direction of induced potential difference (induced current) is given by:

When an electric current flows through a conducting wire,what is produced in the region around it?

What is the function of a field magnet in an $AC$ generator?

$(a)$ Describe an activity to determine the direction of magnetic field produced by a current-carrying straight conductor. Also,show that the direction of the magnetic field is reversed on reversing the direction of current.
$(b)$ An $\alpha$-particle (which is a positively charged particle) enters a uniform magnetic field at right angles to it as shown below. Stating the relevant principle,explain in which direction will this $\alpha$-particle move?

Write any one method to induce current in a coil.

What constitutes the field of a magnet?