The magnetic field at the center of a circular loop carrying an electric current is inversely proportional to $..........$.

Which of the following correctly describes the magnetic field near a long straight wire?

Explain with the help of a labelled diagram the distribution of magnetic field due to a current through a circular loop. Why is it that if a current-carrying coil has $n$ turns,the field produced at any point is $n$ times as large as that produced by a single turn?

$A$ magnetic compass shows a deflection when placed near a current-carrying wire. How will the deflection of the compass be affected if the current in the wire is increased? Support your answer with a reason.

By placing an iron-like metal inside the solenoid,its magnetic field becomes $......$

The direction of the magnetic field produced by a current-carrying straight wire depends on which of the following?