A closely wounded cylindrical coil whose diameter is less in comparison to its length is named as:
Electro magnet
Helical magnet
Solenoid
none of these
In a solenoid the length of a solenoid is greater than its diameter, otherwise we simply call it coil or wire-loop.
What is the name given to a cylindrical coil whose diameter is less in comparison to its length?
(a) What name is given to a cylindrical coil of diameter less than its length ? (b) If a piece of soft iron is placed inside the coil mentioned in part (a) and current is passed in the coil from a battery, what name is then given to the device so obtained ? (c) Give one use of the device mentioned in part (b).