Question

What is the name given to the device which is a long wire wound in a
dese packed helix ? Find the direction of magnetic field around that​

Answer 1

Answer:

Solenoid is the device which is long wire wound in a dese packed helix....

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Answer 2

Answer:

A solenoid (/ˈsolenoid from the French solénoïde, a modern coinage based on Greek "pipe-shaped") is a type of electromagnet, the purpose of which is to generate a controlled magnetic field through a coil wound into a tightly packed helix.