alleryA coil of many turns of insulated copper wire wound as a cylinder is a:
ASonometer
BSpherometer
CSpectrometer
DSolenoid
Answer & Solution
Correct answer: D. Solenoid
1. The shape matters as much as the winding.
2. Many circular turns of insulated copper wire wrapped closely in a cylinder form a solenoid.
3. Its field pattern looks like that of a bar magnet.
_Source: syllabus Science, Ch 13 'Magnetic Effects of Electric Current'_
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