The magnetic field produced by a straight current-carrying conductor is in the form of concentric circles.

How is a current-carrying wire placed in a magnetic field so that the magnetic field does not act on it?

Which instrument works on the principle of 'Electromagnetic induction'?

What is meant by overloading of an electrical circuit? Explain two possible causes due to which overloading may occur in a household circuit. Explain one precaution that should be taken to avoid the overloading of a domestic electric circuit.

What type of core is used to make an electromagnet?

Magnetic field lines of two magnets are shown in figures $A$ and $B$. Select the figure that represents the correct pattern of the field lines. Give reasons for your answer. Also,name the poles of the magnets facing each other.