Home › UCE (O-Level) › Physics › Electromagnetism › Many loops of wire are wound into a cylindrical …
Many loops of wire are wound into a cylindrical coil so that the field of each loop adds to the next. What is this coil called?
AA solenoid
BA capacitor
CA resistor
DA rheostat
Answer & Solution
Correct answer: A. A solenoid
1. Each single loop of current-carrying wire sets up its own magnetic field.
2. Adding loops with the current in the same direction makes the fields add and grow stronger.
3. A cylindrical coil of many such loops is called a solenoid.
4. The field pattern around a solenoid looks like that of a bar magnet, with a north and a south end.
_Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 10: Electromagnetism_
Related questions
A uniform magnetic field lies exactly in the plane of a flat wire loop. What is the magnetA bar magnet is held completely still inside a coil that is connected to a sensitive meterWhich rule gives the direction of the magnetic field around a straight wire carrying a curA compass is held close to a wire while a current flows through the wire. What happens to In an a.c. generator, the slip-rings serve toInduction is greater in a coil whenIn a transformer the primary and secondary coils are usually wound aroundThe d.c. motor uses which rule to predict the direction of rotation?