Question

what happens when wire carrying electric current(DC) is placed near a magnetic needle in one or two words​

Answer 1

Answer:

Deflection happens in compass

Explanation:

Answer 2

Explanation:

Firstly the force induced on the needle is quite week in the case of standard cables and currents one can find handy. This means that the needle when exposed to magnetic field of such strength would move at a slow pace and only if the field is constant (DC current!). On the other hand frequency of 50 or 60 Hz means that the current changes direction 50 or 60 times per second. Just try looking left and right 50 times per second.

Technically the needle starts moving when near enough to the magnetic field, but as soon as it starts it has to change direction and the again and … 50 times per second. Don’t forget to include mechanical momentum of the needle, friction and inertia. This all makes it harder for the needle to move.

This is one period