A SOLENOID is best described as a:
ASingle straight current-carrying conductor
BSingle circular current-carrying loop
CCompass needle inside a glass case
DLong coil of many insulated wire turns
Answer & Solution
Correct answer: D. Long coil of many insulated wire turns
A solenoid is a long coil of many insulated turns of wire. When current flows, the magnetic field inside is uniform; the field outside resembles a bar magnet. Inserting a soft iron core makes it an electromagnet.
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