A coil of many circular turns of insulated copper wire wrapped closely in the shape of a cylinder

Options

A. solenoid
B. antenna
C. diode
D. resistor

Explanation

A coil of many circular turns of insulated copper wire wrapped closely in the shape of a cylinder is called a solenoid. The field lines inside the solenoid are in the form of parallel straight lines. This indicates that the magnetic field is the same at all points inside the solenoid. That is, the field is uniform inside the solenoid. A strong magnetic field produced inside a solenoid can be used to magnetise a piece of magnetic material, like soft
iron, when placed inside the coil. The magnet so formed is called an electromagnet.