Appliances with higher power ratings are connected to which ampere line (in $A$)?

The flow of a current in a circular loop of a wire creates a magnetic field at its centre. How can the existence of this field be detected? State the rule which helps to predict the direction of this magnetic field.

If the direction of current is reversed,the direction of magnetic field is also reversed.

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

Who proposed the principle of electromagnetic induction?

When a light,straight conducting wire is suspended perpendicular to a strong magnetic field and an electric current is passed through it,the magnetic force acting on it is proportional to which of the following?