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

Explanation

A magnetic compass show a deflection, when placed near a current carrying wire as shown in the figure

This deflection of the compass increases because the magentic field B due to current carrying straight conductor is directly proportional to the strength of the current I passing through it. It is expressed as
`" " BpropI`
If the current is incresed then the magnetic field produced is stronger and vice-versa.