The most important safety method used for protecting home appliances from short circuiting or overloading is

What happens to the deflection of the compass needle placed at a point near a current-carrying straight conductor:
$(a)$ If the current is increased?
$(b)$ If the direction of current in the conductor is changed (reversed)?
$(c)$ If the compass is moved away from the conductor?

How is the induced current in a secondary coil related to the current in a primary coil?

On what factors does the force experienced by a current-carrying conductor placed in a uniform magnetic field depend?

Name and state the rule to determine the direction of a force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it. Name a device that uses a current-carrying conductor and a magnetic field.

If you strike a sharp edge of a metallic knife against the north pole of a bar magnet,it will induce a north pole.