Which type of current is obtained from a battery?

$(a)$ Describe an experiment with a diagram to show that force is exerted on a current-carrying conductor when placed perpendicular in a magnetic field.
$(b)$ How will this force change if the current in the conductor is increased?
$(c)$ Name a device that uses the above principle.

Draw a diagram to represent a uniform magnetic field in a given region.

With the help of which law or rule can the direction of a magnetic field be known?

List three sources of magnetic fields.

Magnetic field lines are shown in the given diagram. $A$ student makes a statement that the magnetic field at $X$ is stronger than at $Y$. Justify this statement. Also,redraw the diagram and mark the direction of magnetic field lines.